Show that if two given networks are described by \(Y_{i}=\sum_{j=1}^{M} T_{i j} X_{j}\) and \(Y_{i}^{\prime}=\) \(\sum_{j=1}^{M} T_{i j}^{\prime} X_{j}^{\prime}\), then these networks are interreciprocal if \(T_{j i}=T_{i j}^{\prime}\).