4pq – 3[pq + qr - rp - {p(q-r)-r(p-q)-q(r-p)}]
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4pq-3[pq+qr-rp-{p(q-r)-r(p-q)-q(r-p)}]
4pq-3[pq+qr-rp-{pq-pr-rp+rq-qr+qp}]
4pq-3[pq+qr-rp-pq+pr+rp-rq+qr-qp]
4pq-3[pq-pq+qr+qr-rp+rp-pq-qp+pr+rp-rq+qr]
4pq-3[2qr-2pq+2rp]
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