old_contents: from networkx.algorithms.flow.maxflow import *
  from networkx.algorithms.flow.mincost import *
  from networkx.algorithms.flow.preflow_push import *
  from networkx.algorithms.flow.shortest_augmenting_path import *
  
  del utils
  
new_contents: from . import maxflow, mincost, preflow_push, shortest_augmenting_path
  
  __all__ = sum([maxflow.__all__, mincost.__all__, preflow_push.__all__,
                 shortest_augmenting_path.__all__], [])
  
  from .maxflow import *
  from .mincost import *
  from .preflow_push import *
  from .shortest_augmenting_path import *
  
subject: Modify handling of module conflict in shortest augmenting path maxflow