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plot x-((x-1)^2), (1-x)-((x-0)^2), 1-((1-x)^2), 1-(x^2), if 0<=x<=1
plot x-((x-1)^2), (1-x)-((x-0)^2), 1-((1-x)^2), 1-(x^2), if 0<=x<=1
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