docs: private static void
      transferNonExistingSymbols(List<String> symbolsList,
                                 Map<String, Integer> symbolsMap)
      {
          int sid = 1;
          for (String text : symbolsList)
          {
              assert text == null || text.length() > 0;
  
              if (text != null)
              {
                  putToMapIfNotThere(symbolsMap, text, sid);
              }
  
              sid++;
          }
      }