code: protected void cumulateDistance(final List<LightweightTypeReference> references, Multimap<JvmType, LightweightTypeReference> all,
  			Multiset<JvmType> cumulatedDistance) {
  		for(LightweightTypeReference other: references) {
  			Multiset<JvmType> otherDistance = LinkedHashMultiset.create();
  			initializeDistance(other, all, otherDistance);
  			cumulatedDistance.retainAll(otherDistance);
  			for(Multiset.Entry<JvmType> typeToDistance: otherDistance.entrySet()) {
  				if (cumulatedDistance.contains(typeToDistance.getElement()))
  					cumulatedDistance.add(typeToDistance.getElement(), typeToDistance.getCount());
  			}
  		}
  	}
docs: Keeps the cumulated distance for all the common raw super types of the given references.
  Interfaces that are more directly implemented will get a lower total count than more general
  interfaces.