docs: def _parse_seqs(self, LOS):
          """
          m._parse_seqs(LOS) -- [utility] Build a matrix of counts from a list of sequences
          """
          self.nseqs = len(LOS)
          self.width = len(LOS[0])
          for i in range(self.width):
              Dc = {'A': 0, 'C': 0, 'T': 0, 'G': 0, 'N': 0}
              for seq in LOS:
                  key = seq[i]
                  Dc[key] = Dc[key] + 1
              del(Dc['N'])
              self.counts.append(Dc)