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- 1 + (((a + a) + (b + b)) + (a * a)) + (b * b + 2 * a * b) ≡⟨ cong suc (cong (_+ (b * b + 2 * a * b)) {!!}) ⟩
- 1 + (((a + a) + a * a) + (b + b)) + (b * b + 2 * a * b)
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