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b : c = 2 : 5 (x2)
a : b = 3 : 4
b : c = 4 : 5
a : b : c = 3 : 4 : 5
a : c = 3 : 5
3 : 4
2 : 5
3 : 4 : 10
a : c = 3 : 10