-1/2+(-1/6)-(-1/4)-(+2/3),

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-1/2+(-1/6)-(-1/4)-(+2/3),-1/2+(-1/6)-(-1/4)-(+2/3),-1/2+(-1/6)-(-1/4)-(+2/3),

-1/2+(-1/6)-(-1/4)-(+2/3),
-1/2+(-1/6)-(-1/4)-(+2/3),

-1/2+(-1/6)-(-1/4)-(+2/3),