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 0 1 2 3 2 1 0 0 1 2 3 2 1 0 0 1 2 3 2 1 0 0 1 2 3 2 1 0
 0 1 2 3 3 2 1 0 0 1 2 3 3 2 1 0 0 1 2 3 3 2 1 0 0 1 2 3
 0 1 2 3 4 5 6 6 5 4 3 2 1 0 0 1 2 3 4 5 6 6 5 4 3 2 1 0
 0 1 2 3 4 5 6 7 8 9 10 11 12 13 13 12 11 10 9 8 7 6 5 4 3 2 1 0
 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27