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<?php $a = "abcdefffefa"; $b = "afe"; print(str_replace(array_unique(explode('', $a)), '', $b));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ValueError: explode(): Argument #1 ($separator) cannot be empty in /in/WqSSI:6 Stack trace: #0 /in/WqSSI(6): explode('', 'abcdefffefa') #1 {main} thrown in /in/WqSSI on line 6
Process exited with code 255.

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