code: def lastNode(class_, hot_map):
          ''' Return the very last node (recursively) in the hot map. '''
          children = hot_map[-1][2]
          if children:
              return class_.lastNode(children)
          else:
              return hot_map[-1][1f lastNode(class_, hot_map):
          ''' Return the very last node (recursively) in the hot map. '''
          children = hot_map[-1][2]
          if children:
              return class_.lastNode(children)
          else:
              return hot_map[-1][1]
docs: Return the very last node (recursively) in the hot map.