code: def match(self, a, b):
          if not isinstance(a, UniqueIdentity):
              raise ValueError("<a> is not an instance of UniqueIdentity")
          if not isinstance(b, UniqueIdentity):
              raise ValueError("<b> is not an instance of UniqueIdentity")
          if a.uuid and b.uuid and a.uuid == b.uuid:
              return True
          filtered_a = self.filter(a)
          filtered_b = self.filter(b)
          for fa in filtered_a:
              for fb in filtered_b:
                  if self.match_filtered_identities(fa, fb):
                      return True
          return False