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<?php $arr = [ 0 => [ 1 => "Beanie", ], 1 => [ 2 => "Cap", ] , 2 => [ 1 => "Beanie with Logo", ], ]; print_r(array_merge(...$arr));die;
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Beanie [1] => Cap [2] => Beanie with Logo )

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