a2-b2, (0.5x+4)(0.5x-4), a2-b2., 4x2-25., a³-b³., (0.2e-2)(0.04e2+0.4e+4)., a³-b³, 0.008e³-8, a³+b³., (2y+0.5)(4y2-y+0.25)., a³+b³, 125+64r³, (a+b)2, 4a2+20a+25, (a-b)2, 9-12k+4k2, (a-b)3, 8m3-48m2+96m-64, (a+b)3, 8+48m+96m2+64m3.

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