code: @Override
      public void add(IAtomContainerSet atomContainerSet) {
          for (IAtomContainer iter : atomContainerSet.atomContainers()) {
              addAtomContainer(iter);
          }
          /*
           * notifyChanged() is called by addAtomContainer()
           */
      }
docs: Adds all atomContainers in the AtomContainerSet to this container.
  
  @param  atomContainerSet  The AtomContainerSet