  Recent results have shown how to partition the space of Markov systems into
dynamical equivalence classes. These equivalence classes structure transport
properties in such a way that makes, among other features, their responses
fully symmetric. In this note, I illustrate this approach on two representative
systems. First, I derive analytical expressions for the equivalence classes of
a disordered ring model. Second, I verify on a model of ion transport that,
within an equivalence class, the response of coupled currents is symmetric both
near and far from equilibrium.
