code: def remove_edge(self, u, v):
          print('Dynamically removing uv=(%r, %r)' % (u, v))
          self.graph.remove_edge(u, v)
          e = (u, v)
          if not self.forests[0].has_edge(u, v):
              return
          for i in reversed(range(0, self.level[e] + 1)):
              self.forests[i].remove_edge(u, v)
          for i in reversed(range(0, self.level[e] + 1)):
              Tu = self.forests[i].subtree(u)
              print('Tu = %r' % (list(Tu.nodes()),))
              Tv = self.forests[i].subtree(v)
              print('Tv = %r' % (list(Tv.nodes()),))
              if len(Tu) > len(Tv):
                  Tu, Tv = Tv, Tu
              seen_ = set([])
              for x in Tu.nodes():
                  seen_.add(x)
                  for y in self.graph.neighbors(x):
                      if y in seen_:
                          continue
                      if y in Tv:
                          print('* Found replacement xy=(%r, %r)' % (x, y))
                          if len(self.forests) == i + 1:
                              self.forests.append(DummyEulerTourForest(self.graph.nodes()))
                          for j in range(0, i + 2):
                              print('* Add replacment to F[j=%r]' % (j,))
                              self.forests[j].add_edge(x, y)
                          return
                      else:
                          print('* Charging xy=(%r, %r)' % (x, y))
                          if len(self.forests) == i + 1:
                              self.forests.append(DummyEulerTourForest(self.graph.nodes()))
                          if self.forests[i].has_edge(x, y):
                              self.forests[i + 1].add_edge(x, y)
                          self.level[(x, y)] = i + 1