“…For an excellent review of the empirical settings where power laws is a valid device for representing related phenomena and some theoretical explanations of such a way to fit data, we refer to [54]. In agreement with other linguistic studies [49,61,1,2,8,65], we have tested the validity of the Zipf-Mandelbrot law in properly fitting the data by implementing a best-fit optimization procedure [79,80,43]. In this preliminary phase, we have found statistical compliance of the considered dataset with Zipf-Mandelbrot law, even in presence of (quite) negligible deviations at low ranks (see the fourth step below for a comment on this).…”