code: public Set<String> getCellularLocations()
  	{
  		Set<String> locs = new HashSet<String>();
  		for (PhysicalEntity pe : pes)
  		{
  			CellularLocationVocabulary voc = pe.getCellularLocation();
  			if (voc != null)
  			{
  				for (String term : voc.getTerm())
  				{
  					if (term != null && term.length() > 0) locs.add(term);
  				}
  			}
  		}
  		return locs;
  	}
docs: Retrieves the cellular location of the PhysicalEntity.
  @return cellular location of the PhysicalEntity