code: def linkage_group_ordering(linkage_records):
      new_records = dict()
      for lg_name, linkage_group in itertools.groupby(
          linkage_records, operator.itemgetter(0)
      ):
          new_records[lg_name] = []
          for record in linkage_group:
              init_contig = record[-1]
              start = record[1]
              end = record[2]
              new_record = [init_contig, -3, start, end, 1]
              new_records[lg_name].append(new_record)
      return new_records