A SpinDynamica 109 calculation shows that the relevant subspace of G is spanned by the following ten operators The mixing angle θ 1 mix describes the exchange induced mixing of singlet order for sites A and B, whereas θ 2 mix describes the exchange induced mixing of the corresponding anti-symmetric terms. Although slightly unusual at first, this is nothing surprising. In the intermediate exchange regime it is impossible to strictly separate the dynamical features of spins in site A and B. This implies that the eigenvectors (eigenoperators) of G are also inseparable.