7a + 5 - 12, 19, 26, 33, 40..., 5a - 6 - -1, 4, 9, 14, 19..., 8a + 2 - 10, 18, 26, 34, 42..., 2a - 7 - -5, -3, -1, 1, 3, 5..., 3a + 3 - 6, 9, 12, 15, 18,

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