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{ 16, 17, 18, 22, 23, 24, 27, 28, 29 }
{ 8 }
{ }
{ 1, 2, 3, 6, 7, 11, 12, 13, 19, 20, 21, 25, 26, 30, 34, 35, 37, 38, 39, 42, 43, 44, 47, 48, 49, 52, 53, 54, 57, 58, 59 }
{ 31, 36 }
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