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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