From 3ec3ae68d2cea32461d779645a737d57160631bf Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= Date: Thu, 19 May 2022 09:50:48 +0200 Subject: [PATCH 1/2] basic/strv: add optimizable version of strv_push/consume/extend This will be helpful in cases where we are repeatedly adding entries to a long strv and want to skip the iteration over old entries leading to quadratic behaviour. Note that we don't want to calculate the length if not necessary, so the calculation is delayed until after we've checked that value is not NULL. --- src/basic/strv.c | 30 ++++++++++++++++++------------ src/basic/strv.h | 24 +++++++++++++++++++++--- src/test/test-strv.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 82 insertions(+), 15 deletions(-) diff --git a/src/basic/strv.c b/src/basic/strv.c index 22f5402575..b2fe8d9d4e 100644 --- a/src/basic/strv.c +++ b/src/basic/strv.c @@ -403,27 +403,33 @@ char* strv_join_full(char * const *l, const char *separator, const char *prefix, return r; } -int strv_push(char ***l, char *value) { - char **c; - size_t n; +int strv_push_with_size(char ***l, size_t *n, char *value) { + /* n is a pointer to a variable to store the size of l. + * If not given (i.e. n is NULL or *n is SIZE_MAX), size will be calculated using strv_length(). + * If n is not NULL, the size after the push will be returned. + * If value is empty, no action is taken and *n is not set. */ if (!value) return 0; - n = strv_length(*l); + size_t size = n ? *n : SIZE_MAX; + if (size == SIZE_MAX) + size = strv_length(*l); /* Check for overflow */ - if (n > SIZE_MAX-2) + if (size > SIZE_MAX-2) return -ENOMEM; - c = reallocarray(*l, GREEDY_ALLOC_ROUND_UP(n + 2), sizeof(char*)); + char **c = reallocarray(*l, GREEDY_ALLOC_ROUND_UP(size + 2), sizeof(char*)); if (!c) return -ENOMEM; - c[n] = value; - c[n+1] = NULL; + c[size] = value; + c[size+1] = NULL; *l = c; + if (n) + *n = size + 1; return 0; } @@ -484,10 +490,10 @@ int strv_insert(char ***l, size_t position, char *value) { return free_and_replace(*l, c); } -int strv_consume(char ***l, char *value) { +int strv_consume_with_size(char ***l, size_t *n, char *value) { int r; - r = strv_push(l, value); + r = strv_push_with_size(l, n, value); if (r < 0) free(value); @@ -529,7 +535,7 @@ int strv_prepend(char ***l, const char *value) { return strv_consume_prepend(l, v); } -int strv_extend(char ***l, const char *value) { +int strv_extend_with_size(char ***l, size_t *n, const char *value) { char *v; if (!value) @@ -539,7 +545,7 @@ int strv_extend(char ***l, const char *value) { if (!v) return -ENOMEM; - return strv_consume(l, v); + return strv_consume_with_size(l, n, v); } int strv_extend_front(char ***l, const char *value) { diff --git a/src/basic/strv.h b/src/basic/strv.h index b9563e8692..c567785cdb 100644 --- a/src/basic/strv.h +++ b/src/basic/strv.h @@ -35,18 +35,36 @@ size_t strv_length(char * const *l) _pure_; int strv_extend_strv(char ***a, char * const *b, bool filter_duplicates); int strv_extend_strv_concat(char ***a, char * const *b, const char *suffix); int strv_prepend(char ***l, const char *value); -int strv_extend(char ***l, const char *value); + +/* _with_size() are lower-level functions where the size can be provided externally, + * which allows us to skip iterating over the strv to find the end, which saves + * a bit of time and reduces the complexity of appending from O(n²) to O(n). */ + +int strv_extend_with_size(char ***l, size_t *n, const char *value); +static inline int strv_extend(char ***l, const char *value) { + return strv_extend_with_size(l, NULL, value); +} + int strv_extendf(char ***l, const char *format, ...) _printf_(2,0); int strv_extend_front(char ***l, const char *value); -int strv_push(char ***l, char *value); + +int strv_push_with_size(char ***l, size_t *n, char *value); +static inline int strv_push(char ***l, char *value) { + return strv_push_with_size(l, NULL, value); +} int strv_push_pair(char ***l, char *a, char *b); + int strv_insert(char ***l, size_t position, char *value); static inline int strv_push_prepend(char ***l, char *value) { return strv_insert(l, 0, value); } -int strv_consume(char ***l, char *value); +int strv_consume_with_size(char ***l, size_t *n, char *value); +static inline int strv_consume(char ***l, char *value) { + return strv_consume_with_size(l, NULL, value); +} + int strv_consume_pair(char ***l, char *a, char *b); int strv_consume_prepend(char ***l, char *value); diff --git a/src/test/test-strv.c b/src/test/test-strv.c index 331c277c35..b892396f05 100644 --- a/src/test/test-strv.c +++ b/src/test/test-strv.c @@ -601,6 +601,25 @@ TEST(strv_extend_strv) { assert_se(strv_length(n) == 4); } +TEST(strv_extend_with_size) { + _cleanup_strv_free_ char **a = NULL; + size_t n = SIZE_MAX; + + a = strv_new("test", "test1"); + assert_se(a); + + assert_se(strv_extend_with_size(&a, &n, "test2") >= 0); + assert_se(n == 3); + assert_se(strv_extend_with_size(&a, &n, "test3") >= 0); + assert_se(n == 4); + + assert_se(streq(a[0], "test")); + assert_se(streq(a[1], "test1")); + assert_se(streq(a[2], "test2")); + assert_se(streq(a[3], "test3")); + assert_se(a[4] == NULL); +} + TEST(strv_extend) { _cleanup_strv_free_ char **a = NULL, **b = NULL; @@ -746,6 +765,30 @@ TEST(strv_push_prepend) { assert_se(!a[5]); } +TEST(strv_push_with_size) { + _cleanup_strv_free_ char **a = NULL; + size_t n = 0; + char *i, *j; + + assert_se(i = strdup("foo")); + assert_se(strv_push_with_size(&a, &n, i) >= 0); + assert_se(n == 1); + + assert_se(i = strdup("a")); + assert_se(j = strdup("b")); + assert_se(strv_push_with_size(&a, &n, i) >= 0); + assert_se(n == 2); + assert_se(strv_push_with_size(&a, &n, j) >= 0); + assert_se(n == 3); + + assert_se(streq_ptr(a[0], "foo")); + assert_se(streq_ptr(a[1], "a")); + assert_se(streq_ptr(a[2], "b")); + assert_se(streq_ptr(a[3], NULL)); + + assert_se(n = strv_length(a)); +} + TEST(strv_push) { _cleanup_strv_free_ char **a = NULL; char *i, *j; From eb164c51eab0d397f2e1370c7cbfd480877f28a0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= Date: Thu, 19 May 2022 10:38:27 +0200 Subject: [PATCH 2/2] resolved: use strv_extend_with_size() to avoid slow parsing of /etc/hosts MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=43942 is a simple case where a repeated entry generates a timeout. I didn't import that case, but generated a simpler one by hand. $ time build/fuzz-etc-hosts test/fuzz/fuzz-etc-hosts/timeout-many-entries test/fuzz/fuzz-etc-hosts/timeout-many-entries... ok build/fuzz-etc-hosts test/fuzz/fuzz-etc-hosts/timeout-many-entries 3.17s (old) ↓ build/fuzz-etc-hosts test/fuzz/fuzz-etc-hosts/timeout-many-entries 0.11s (new) I considered simply disallowing too many aliases. E.g. microsoft appearently sometimes ignores entries after the ninth [1], and other systems set stringent limits [2,3], but the recommended way to get around that is to simply use more lines (as is done in the sample), so this wouldn't change anything. Even if we cannot put all those names in a reply packet, the resolution from the alias to the address should work. I think cases where people define lots and lots of aliases through some programmatic interface is realistic, for example for a blocklist, and such a file shouldn't bring resolved down to its knees. [1] https://superuser.com/questions/932112/is-there-a-maximum-number-of-hostname-aliases-per-line-in-a-windows-hosts-file [2] https://library.netapp.com/ecmdocs/ECMP1516135/html/GUID-C6F3B6D1-232D-44BB-A76C-3304C19607A3.html [3] https://www.ibm.com/docs/en/zos/2.1.0?topic=optional-creating-etchosts --- src/resolve/resolved-etc-hosts.c | 4 +- src/resolve/resolved-etc-hosts.h | 1 + test/fuzz/fuzz-etc-hosts/timeout-strv | 1000 +++++++++++++++++++++++++ 3 files changed, 1003 insertions(+), 2 deletions(-) create mode 100644 test/fuzz/fuzz-etc-hosts/timeout-strv diff --git a/src/resolve/resolved-etc-hosts.c b/src/resolve/resolved-etc-hosts.c index a1d797b111..8a58db4a21 100644 --- a/src/resolve/resolved-etc-hosts.c +++ b/src/resolve/resolved-etc-hosts.c @@ -127,7 +127,7 @@ static int parse_line(EtcHosts *hosts, unsigned nr, const char *line) { continue; } - r = strv_extend(&item->names, name); + r = strv_extend_with_size(&item->names, &item->n_names, name); if (r < 0) return log_oom(); @@ -391,7 +391,7 @@ int manager_etc_hosts_lookup(Manager *m, DnsQuestion* q, DnsAnswer **answer) { } if (found_ptr) { - r = dns_answer_reserve(answer, strv_length(item->names)); + r = dns_answer_reserve(answer, item->n_names); if (r < 0) return r; diff --git a/src/resolve/resolved-etc-hosts.h b/src/resolve/resolved-etc-hosts.h index c85926a3dc..df66e714da 100644 --- a/src/resolve/resolved-etc-hosts.h +++ b/src/resolve/resolved-etc-hosts.h @@ -9,6 +9,7 @@ typedef struct EtcHostsItem { struct in_addr_data address; char **names; + size_t n_names; } EtcHostsItem; typedef struct EtcHostsItemByName { diff --git a/test/fuzz/fuzz-etc-hosts/timeout-strv b/test/fuzz/fuzz-etc-hosts/timeout-strv new file mode 100644 index 0000000000..e54081661d --- /dev/null +++ b/test/fuzz/fuzz-etc-hosts/timeout-strv @@ -0,0 +1,1000 @@ +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c 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z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l 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q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c 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q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c 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t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i 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z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z +::1 a b c d e f g h i j k l m n o p q r s t u v w x y z