code: Set<NFAState<T>> nfaTransitsFor(CharRange condition)
      {
          Set<NFAState<T>> nset = new NumSet<>();
          for (NFAState<T> nfa : nfaSet)
          {
              nset.addAll(nfa.transit(condition));
          }
          return nset;
      }
docs: Returns a set of nfA states to where it is possible to move by nfa transitions.
  @param condition
  @return