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(1/2 - a)^2 +(sqrt(3)/2-b)^2=r^2, (1 - a)^2 +(0 - b)^2=r^2, (3 - a)^2 +(0 - b)^2=r^2
(1/2 - a)^2 +(sqrt(3)/2-b)^2=r^2, (1 - a)^2 +(0 - b)^2=r^2, (3 - a)^2 +(0 - b)^2=r^2
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