old_contents: """Classes representing the data model of the Projet Pensées Profondes."""
  
  from .abstractnode import AbstractNode
  from .triple import Triple
  from .missing import Missing
  from .resource import Resource
  
  __all__ = ['AbstractNode', 'Triple', 'Missing', 'Resource']
  
new_contents: """Classes representing the data model of the Projet Pensées Profondes."""
  
  from .abstractnode import AbstractNode
  from .triple import Triple
  from .missing import Missing
  from .resource import Resource
  from .sentence import Sentence
  
  __all__ = ['AbstractNode', 'Triple', 'Missing', 'Resource', 'Sentence']
  
subject: Fix missing import.