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<?php var_dump(array_flip(range('a', 'z')));
Output for git.master, git.master_jit, rfc.property-hooks
array(26) { ["a"]=> int(0) ["b"]=> int(1) ["c"]=> int(2) ["d"]=> int(3) ["e"]=> int(4) ["f"]=> int(5) ["g"]=> int(6) ["h"]=> int(7) ["i"]=> int(8) ["j"]=> int(9) ["k"]=> int(10) ["l"]=> int(11) ["m"]=> int(12) ["n"]=> int(13) ["o"]=> int(14) ["p"]=> int(15) ["q"]=> int(16) ["r"]=> int(17) ["s"]=> int(18) ["t"]=> int(19) ["u"]=> int(20) ["v"]=> int(21) ["w"]=> int(22) ["x"]=> int(23) ["y"]=> int(24) ["z"]=> int(25) }

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