code: public static <I, O> MealyCacheOracle<I, O> createTreeCache(Alphabet<I> alphabet,
                                                                  MembershipOracle<I, Word<O>> mqOracle) {
          return MealyCacheOracle.createTreeCacheOracle(alphabet, mqOracle);
      }
docs: Creates a cache oracle for a Mealy machine learning setup, using a tree for internal cache organization.
  
  @param alphabet
  the input alphabet
  @param mqOracle
  the membership oracle
  
  @return a Mealy learning cache with a tree-based implementation