AUTHOREA
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\begin{equation} \mathcal{T}(\mathcal{n})=\sum\frac{(a-b)(a-c)(a-d)(a-e)(b-c)(b-d)(b-e)(c-d)(c-e)(d-e)}{1\,!\,2\,!\,3\,!\,4\,!}\nonumber \\ \end{equation}