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Group-1
1, 10, 19, 28, 30, 31, 13, 15, 20, 21

Group-2
2, 3, 4, 5, 14, 18, 17, 16, 12, 22

Group-3
23, 24, 25, 26, 27, 29, 6, 7, 8, 9, 11