code: def _find_known(row):
      
      out = []
      clinvar_no = set(["unknown", "untested", "non-pathogenic", "probable-non-pathogenic",
                        "uncertain_significance", "uncertain_significance", "not_provided",
                        "benign", "likely_benign"])
      if row["cosmic_ids"] or row["cosmic_id"]:
          out.append("cosmic")
      if row["clinvar_sig"] and not row["clinvar_sig"].lower() in clinvar_no:
          out.append("clinvar")
      return out
docs: Find variant present in known pathogenic databases.