(x-2p)^2, x^2-4xp+4p^2, x^2- 4p^2, x^2+4px-4p^2, (m-1) (2+n), 2m-mn+2-n, 2m+mn-2-n, 2m-2, (1/2p-1/4q)^2, 1/4p^2-1/8q^2, 1/2p^2+ 1/4 pq - 1/16q^2, 1/4p^2-1/4pq+1/16q^2

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