code: public static <I, O> MealyCacheOracle<I, O> createDynamicTreeCache(MembershipOracle<I, Word<O>> mqOracle) {
          return MealyCacheOracle.createDynamicTreeCacheOracle(mqOracle);
      }
docs: Creates a cache oracle for a Mealy machine learning setup with a dynamic alphabet storage, using a tree for
  internal cache organization.
  <p>
  Note: Due to the dynamic alphabet storage, memory consumption of a dense tree may be higher than normal caches
  with a predefined alphabet. However, for sparse data, the memory consumption may be lower as only memory for the
  actual data of the tree is allocated.
  
  @param mqOracle
  the membership oracle
  
  @return a Mealy learning cache with a tree-based implementation