a b
2 3-b 2 a {3,3} 1 0
--- 2 4 2a {3,4} r2 1 r2 = 1.41421356
4-2b a 2a 3 {3,5} fi fi fi = 1.61803398875
{3,6} r3 2 r3 = 1.73205080757
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