This software was used to implement probabilistic suffix trees (Ron, Singer and Tishby 1996) for the paper "Long-range order in canary song" by Markowitz et al. (PLoS Comp Bio 2013). Data must be formatted as a cell array of characters. Start by building the transition matrices with pst_build_trans_mat.m and pass the resulting output to pst_learn.m. See the function help for further guidance.