(p+q) (p^2-q^2) + (p-q) (p^2+q^7)
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(P^3-pq^2+pq^2-q^3)+(p^3+pq^7-qp^2-q^8)
P^3-q^3+p^3+pq^7-qp^2-q^8
2p^3 -q^3+p^3+pq^7-qp^2-q^8
P^3-q^3+p^3+pq^7-qp^2-q^8
2p^3 -q^3+p^3+pq^7-qp^2-q^8
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