code: public Callable<ResponderResult> createSequence(final Responder responder, final ResultHandler resultHandler) {
          return new Sequence<>(this, this.chainResponder(responder, resultHandler));
      }
docs: Create a Callable that will execute another responder if this one is successful, with a specified resultHandler for the
  second one.
  
  @param responder  responder
  @param resultHandler handler
  @return sequence