-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