code: public static EnglishLemmatizer getInstance() {
        if (INSTANCE == null) {
           synchronized (EnglishLemmatizer.class) {
              if (INSTANCE != null) {
                 return INSTANCE;
              }
              INSTANCE = new EnglishLemmatizer();
           }
        }
        return INSTANCE;
     }
docs: Gets instance.
  
  @return the instance