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integrate (Boole[max(min(x,y),|y-x|,1-max(x,y)) < z]) over x=0 to 1 and y=0 to 1
integrate (Boole[max(min(x,y),|y-x|,1-max(x,y)) < z]) over x=0 to 1 and y=0 to 1
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