plot (x/(x+y)) (1 - (1-y)(1+0.5x-0.75y)/((1+x-0.5y)(2-0.5x-0.75y))) + (y/(x+y)) ((1-x)(1-0.75x+0.5y)/((1-0.5x+y)(2-0.75x-0.5y))); x=0 to 1; y=0 to 1

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