code: def inDignities(self, idA, idB):
          
          objA = self.chart.get(idA)
          info = essential.getInfo(objA.sign, objA.signlon)
          # Should we ignore exile and fall?
          return [dign for (dign, ID) in info.items() if ID == idB]
docs: Returns the dignities of A which belong to B.