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(-1/4)*(-8-4)+(1/2)*(2-4) = 3-4
(1/2)*(2-4)-1/4*(-8-4) = -1
(1/2)*(2-4)-1/4*(-(4+8)) = -1
(1/2)*(2-4)-12*(-1/4) = -1
1/4*12+(1/2)*(2-4) = -1
(1/2)*(2-4)+3 = -1
1/2*(2-4)+3 = -1
3-2*1/2 = -1
3-1 = -1
2 = -1
L <> R
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