code: def _get_purecn_dx_files(paired, out):
      
      out_base = "%s-dx" % utils.splitext_plus(out["rds"])[0]
      all_files = []
      for key, ext in [[("mutation_burden",), "_mutation_burden.csv"],
                       [("plot", "signatures"), "_signatures.pdf"],
                       [("signatures",), "_signatures.csv"]]:
          cur_file = "%s%s" % (out_base, ext)
          out = tz.update_in(out, key, lambda x: cur_file)
          all_files.append(os.path.basename(cur_file))
      return out_base, out, all_files
docs: Retrieve files generated by PureCN_Dx