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[[1], []] [[2], [2]] [[4], [2, 3]] [[7], [2, 3, 5, 7]] [[20], [2, 3, 5, 7, 11, 13, 17, 19]] [[50], [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47]]
