“…Previously, the problem of representing the number of moving points in this dynamical system (the number of wave packets in the network) as a function of time was studied in detail, e.g. in [4,5,6,7,8,9,14]. In order to avoid possible confusion when looking through the mentioned papers, we explicitly warn the reader that there is no standard notation among the authors: in some papers the above process is interpreted as the 'endpoints of a random walk on a metric graph' (e.g.…”