x4-x3+x3+x3-x2+x2+x-x+1
x2*(x2-x+1)+x*(x2-x+1)+x2-x-1
(x2-x+1)*(x2+x+1)
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x4-x3+x3+x3-x2+x2+x-x+1
x2*(x2-x+1)+x*(x2-x+1)+x2-x-1
(x2-x+1)*(x2+x+1)