a + a + a + a - 4a, b + 2a + 3b - a - a + 4b, 2a + 5b - 3a + 6b - 11b - a , 7a + 5a - 3b - b - 12a - 4b, a + 7b + 5c - 5b + 3a - 4a + 2b + 5c, -4a - 2b - 3a - 6b - -7a - 8b, 2a - 3b + 5b + b - 2a + 3b, 5a + 4b - 2b + 3a - 5b +2a - 10a - 3b,

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