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3/2+5/2+7/2+1 = 0
5/2+7/2+1+3/2 = 0
7/2+1+3/2+5/2 = 0
7/2+1+4 = 0
1+7/2+4 = 0
1+15/2 = 0
17/2 = 0
L <> R
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