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<?php $UUID = "f9e113324bd449809b98b0925eac3141"; echo preg_replace('/(?:^.{4})?.{4}\K/', '-', $UUID, 4);
Output for git.master, git.master_jit, rfc.property-hooks
f9e11332-4bd4-4980-9b98-b0925eac3141

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