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b {2,3,5}, {2,3,7}, {2,3,11}, {2,5,7}, {2,7,11}, {2,5,11}, {3,5,7}, {3,5,11}, {3,7,11}, {5,7,11}
c : {2,3,5,7}, {2,3,5,11}, {2,5,7,11}, {2,3,7,11}, {3,5,7,11}