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expand (x+ x² + x³ + x⁴)(x+ x² + x³ + x⁴ + x^5 + x⁶ + x⁷ + x^8)
expand (x+ x² + x³ + x⁴)(x+ x² + x³ + x⁴ + x^5 + x⁶ + x⁷ + x^8)
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