1/2 + 1/2 -[ 1/2+1/2-1/2]
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1/2+1/2 -[1+1/2-1/2]
1/2+1/2-[2/2-1/2]
1/2+1/2-[2-1\2]
1/2+1/2-1/2
1+1/2-1/2
2/2-1/2
2-1/2
1/2
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