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<?php $lettersArray = ['A','C','E','G']; $letters = array_combine($lettersArray, array_fill(0,count($lettersArray), [])); var_dump($letters);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { ["A"]=> array(0) { } ["C"]=> array(0) { } ["E"]=> array(0) { } ["G"]=> array(0) { } }

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