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4*2*2=2*(b*b+c*c)-a*a; 4*3.5*3.5=2*(a*a+c*c)-b*b; 4*3*3=2*(a*a+b*b)-c*c
4*2*2=2*(b*b+c*c)-a*a; 4*3.5*3.5=2*(a*a+c*c)-b*b; 4*3*3=2*(a*a+b*b)-c*c
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