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(1/2)*(-2/9)+(2/5)*(2-2/9) = -1
1/2*(-2/9)+(2/5)*(2-2/9) = -1
(2/5)*(2-2/9)-2/9*1/2 = -1
(2/5)*(2-2/9)-1/9 = -1
2/5*(2-2/9)-1/9 = -1
2/5*16/9-1/9 = -1
32/45-1/9 = -1
3/5 = -1
L <> R
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