    if (d12 && !d23) {          // 1 is different
      close(file[1]);
      if (save_uniques) {
        unique_to_db(dbh, path1, "3-compare1");
      }
      compare_two_open_files(dbh, path2, file[2], path3, file[3], size, bread);
      return;
    }
