code: @Override
      public Iterable<IAtomContainer> atomContainers() {
          return new Iterable<IAtomContainer>() {
  
              @Override
              public Iterator<IAtomContainer> iterator() {
                  return new AtomContainerIterator();
              }
          };
      }
docs: Get an iterator for this AtomContainerSet.
  
  @return A new Iterator for this AtomContainerSet.