code: private String getElementSymbol(String sym) {
          if (sym.equals("Si")) {
              return "Q";
          }
          if (sym.equals("Cl")) {
              return "X";
          }
          if (sym.equals("Br")) {
              return "Y";
          }
          if (sym.equals(",")) {
              return "";
          }
          return sym;
      }
docs: Returns the Bremser-compatible symbols for a given element. Silicon, for
  example, is actually "Q". :-)
  
  @param  sym  The element symbol to be converted
  @return      The converted symbol