code: @Override
      public final boolean containsAll(final Collection<? extends E> collection) {
          for(E element : collection) {
              if(!this.contains(element)) {
                  return false;
              }
          }
          return true;
      }
docs: Test if the lattice contains all elements of the given collection.
  @param collection of elements
  @return true if lattice contains all elements of the given collection