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= (p² - 4pq + 4q²) (p² - 4pq + 4q²)
= p^4 - 4p³q + 4p²q² - 4p³q + 16p²q² - 16pq³ + 4p²q² -16pq³ + 16q^4
= p^4 - 8 p³q + 24p²q² - 32 pq³ + 16q^4