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<?php $id = 79891959856; $len = strlen($id); $input = "FDFDSFD"; $final_len = 6+strlen($input)-$len; echo str_pad($input, $final_len, "0", STR_PAD_RIGHT).$id;
Output for git.master, git.master_jit, rfc.property-hooks
FDFDSFD79891959856

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