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$\sum _{i=1}^{n} \sum _{j=1}^{n} \sum _{k=1}^{n}\sum _{l=1}^{n} A(i,j)A(i,k)A(i,l)A(j,k)A(j,l)A(k,l) $
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$\sum _{i=1}^{n} \sum _{j=1}^{n} \sum _{k=1}^{n}\sum _{l=1}^{n} A(i,j)A(i,k)A(i,l)A(j,k)A(j,l)A(k,l) $
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