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// input: [["a", "b", "c", "d"]] // output: ["c", "b", "a", "d"] package { public class ArrayAccess { public static function main(ar:Array):Array { var aa:ArrayAccess = new ArrayAccess(); return aa.f(ar, 2); } private function f(ar:Array, num:Number):Array{ var x:String = ar[0]; var y:String = ar[num % ar.length]; ar[0] = y; ar[num] = x; return ar; } } }