3, 2 ___ 4, 6, 5 ___ 7, 4, 3 ___ 5, 9, 8 ___ 10, 12, 11 ___ 13, 19, 18 ___ 20, 13, 12 ___ 14, 7, 6 ___ 8, 10, 9 ___ 11, 18, 17 ___ 19, 2, 1 ___ 3, 5, 4 ___ 6, 8, 7 ____  9, 11, 10 ___ 12.

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