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x/2 + y/3 + r/4 = 1,x/3 + y/4 + r/5 = 1,x/4 + y/5 + r/6 = 1
x/2 + y/3 + r/4 = 1,x/3 + y/4 + r/5 = 1,x/4 + y/5 + r/6 = 1
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