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a b c d e f
a.d - a.e + a.f + b.d - b.e + b.f - c.d + c.e - c.f
(2/28)x^5 - (4/21)x^4y + (10/42)x³y² = a.d - a.e + a.f
(1/8)x³y² - (2/6)x²y³ + (5/12)xy^4 = b.d - b.e + b.f
- (1/20)x^4y + (2/15)x³y² - (5/30)x²y³ = - c.d + c.e - c.f