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triangle-coffee

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Jul 5th, 2014
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  1. d=(x,y,a,b,c,d,e,f)->(z=(a,b,c,d)->(y-b)*(c-a)-(x-a)*(d-b)>0);(z(a,b,c,d)+z(c,d,e,f)+z(e,f,a,b))%3==0
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