code: def _create_counts(out_dts, out_dir):
      
      ma, ma_mirna = _merge(out_dts)
      out_ma = op.join(out_dir, "counts.tsv")
      out_ma_mirna = op.join(out_dir, "counts_mirna.tsv")
      ma.to_csv(out_ma, sep="\t")
      ma_mirna.to_csv(out_ma_mirna, sep="\t")
      return out_ma_mirna, out_ma
docs: Summarize results into single files.