Let me write the energy landscape as a general Markov chain as in Fig. . Notice how transitions between configurations of the same energy level do not occur and the Markov chain has very few branched nodes compared to its number of nodes. This is an important postulate since it allows me later to simplify local transitions along the Markov chain (Fig. ). It originates from the idea that configurations of the same energy are in the vast majority too different to be accessible through singular transitions.