code: public static <I> CompactDFA<I> and(DFA<?, I> dfa1, DFA<?, I> dfa2, Alphabet<I> inputAlphabet) {
          return and(dfa1, dfa2, inputAlphabet, new CompactDFA<>(inputAlphabet));
      }
docs: Calculates the conjunction ("and") of two DFA, and returns the result as a new DFA.
  
  @param dfa1
  the first DFA
  @param dfa2
  the second DFA
  @param inputAlphabet
  the input alphabet
  
  @return a new DFA representing the conjunction of the specified DFA