plot 0, (1-x)(1-y), (1-x)*y, 1-x, x*(1-y), 1-y, x+y-2*x*y,1-x*y,x*y,1-x-y+2*x*y,y,1-y+x*y,x,1-x+x*y,x+y-x*y,1,x=0...1,y=0...1

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