5a, 3a + 2a, 4a, 7a - 3a, 4a + 2b, 4a +3b - b, 9a + 6b, 12a + 6b - 3a, 3a, a + a + a, 2a2 + 2a, 2a2 + a + a, a2 - 3a, 3a2 + 2a2 - 3a, 6a, a + a + a + a + a + a, 7a + 3b, 3a + 5a - 3b + 6b - a, 3a2 + 4a, 4a2 - 3a + 7a - a2, 6a + 7b, 4b + 3b + 10a - 4a

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