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Maximally Helicity Violating (MHV) amplitude for gluons scattering \begin{align} {\cal A}(i^-,\, j^-) \,=\,  {\langle i\,j\rangle^4 \over \langle 1\,2\rangle \langle 2\,3\rangle \cdots \langle n\,1\rangle } \end{align}