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<?php function CE50($CE50) { $CE50 = ''; $CE50 = str_replace("a", ")`", $CE50); $CE50 = str_replace("b", "(~", $CS50); $CE50 = str_replace("c", "*`", $CS50); $CE50 = str_replace("d", "&~", $CS50); $CE50 = strrev(substr($CE50, 0, 50)); return $CE50; } echo CE50("abccbaaabc"); ?>

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