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solve 3(S-l)^2+D^2=3^2, 3S^2+(l-D)^2=4^2, 3S^2+(l+D)^2=5^2
solve 3(S-l)^2+D^2=3^2, 3S^2+(l-D)^2=4^2, 3S^2+(l+D)^2=5^2
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