code: public static TextNormalization configuredInstance() {
        if (INSTANCE == null) {
           synchronized (TextNormalization.class) {
              if (INSTANCE == null) {
                 INSTANCE = new TextNormalization();
                 INSTANCE.initConfig();
              }
           }
        }
        return INSTANCE;
     }
docs: Configured instance text normalization.
  
  @return A TextNormalization class configured via config files.