4, 5, 6, , 5, 6, 7, , 4, 2, 3, , 5, 6, 7, , 16, 17, 18, , 12, 13, 14, , 18, 19, 20, , 7, 8, 9, , 10, 11, 12, , 11, 12, 13, , 7, 12, 5, , 5, 6, 7, , 11, 12, 13, , 8 blocks, 10 blocks, 12 blocks, , 8 blocks, 10 blocks, 12 blocks.

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