docs: public String getUsage()
      {
          if (usage == null)
          {
              StringBuilder usageSB;
  
              usageSB = new StringBuilder();
              for (int i = 2; i < lines.size(); i++)
              {
                  String line;
  
                  line = lines.get(i);
                  if (END_OF_PROPER_USAGE.equals(line))
                  {
                      break;
                  }
  
                  usageSB.append(line.trim());
                  usageSB.append(" ");
              }
              usage = usageSB.toString().trim();
          }
          return usage;
      }