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<?php $sentence = 'subdermatoglyphic'; $alphabet = range('a', 'z'); echo implode( array_diff( $alphabet, preg_split( '~[^a-z]*~i', $sentence, 0, PREG_SPLIT_NO_EMPTY ) ) );
Output for git.master, git.master_jit, rfc.property-hooks
fjknqvwxz

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