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= (m³ * am) + (m³ * a) + (-m² * am) + (-m² * a) + (m⁻² * am) + (m⁻² * a)
= am⁴ + am³ - am³ - am² + am⁻¹ + am⁻²
= am⁴ - am² + am⁻¹ + am⁻²
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