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12 - 11___13, 2 - 1___3, 9 - 8___10, 8 - 7___9, 13 - 12___14, 11 - 10___12, 18 - 17___19, 15 - 14___16, 16 - 15___17, 14 - 13___15, 20 - 19___21, 17 - 16___18, 19 - 18___20, 7 - 6___8, 5 - 4___6,

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