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I.e. with global symmetry and breaking pattern $SU(n)_L\\times SU(n)_R\\to SU(n)_V$, $SU(2n)\\to SO(2n)$ and $SU(2n)\\to Sp(2n)$. We obtain fully analytical expressions for all these cases. We discuss the general structure of the amplitude and the structure of the possible intermediate channels for all three cases. 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