V arr = [
          [
            [1,2,3],
            [4,5,6]
          ],
          [
            [11,22,33],
            [44,55,66]
          ],
          [
            [111,222,333],
            [444,555,666]
          ],
          [
            [1111,2222,3333],
            [4444,5555,6666]
          ]
        ]