code: public static List<EntityInfo> findPolyEntities(List<List<Chain>> polyModels) {
  		TreeMap<String,EntityInfo> chainIds2entities = findEntitiesFromAlignment(polyModels);
  
  		List<EntityInfo> entities = findUniqueEntities(chainIds2entities);
  
  		return entities;
  	}
docs: Utility method that employs some heuristics to find the {@link EntityInfo}s
  for the polymeric chains given in constructor.
  To be used in case the information is missing in PDB/mmCIF file
  @return