n^2-1^2+n^2+n^2+1^2/3=n^2
(++)/3=(-n-n+1+++n+n+1)/3=(3+2)/3=+2/3
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n^2-1^2+n^2+n^2+1^2/3=n^2
(++)/3=(-n-n+1+++n+n+1)/3=(3+2)/3=+2/3