(a^4 + 9)^2 (a^2 - 9)^3 (x^2 + 3)^2 (a^6 + 2)^2.
(a^4 - b^2)^2 (a^3 - b^3)^2 (x^3 + b^2)^3 (a^3 + b^3)^2.
(x^3 - y^3)^2 (x - y)^2 (2x - 3y)^2 (4x - 2y)^2.
(m + 1)^2 (m^2 - 2m)^2 (m^2 + 2m)^2 (m^3 - m)^2.
(1 - a^4)^2 (2 + a^2)^2 (4 - a^4)^2 (1 - a^5)^2.
(6b - 3a^2)^2 (3b - 5a^2)^2 (b + 25a^2)^2 (2b + 5a^2)^2.
(7xy + x^2)^2 (7xy + 7x^2)^2 (1 + 7x^2y)^2 (1 - 7x^2)^2.
(2x - 5y)^2 (x + 15y)^2 (x - 5y)^2 (2x + 5y)^2.
(40x^5 + x)^2 (20x^5 - x)^2 (40x^6 + x)^2 (20x^5 + 1)^2.
(1ax^5 + 8x)^2 (1 + 8a^4)^2 (1 - 8ax^2)^2 (8 + 8ax^2)^2.
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