113(-x-y)(x-y)
221122(3mn+)(3mn-)-4mn
44x2-(x+3)(x-3)
(x+4y+2z)(x+4y-2z)
xx22
(+4)-(-4) 33(-7x+6)(-7x-6)
(9x-2)(9x-2)
12(-x+3y) 2132-3(x+y)
32332(-x-3y)(x+3y)
2211(mn+)(mn-)-2m2n2
44x-(x+3)(x-3)
2
(2x+2y+z)(2x+2y-z)
xx22
(+5)-(-5) 33(-3x-9)(-3x+9)
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