docs: def from_stanford_dependencies(this_class, stream, trees,
                                     include_erased=False, include_punct=True):
          """Construct a Corpus. stream is an iterable over strings where
          each string is a line representing a Stanford Dependency as in
          the output of the command line Stanford Dependency tool:
  
              deprel(gov-index, dep-depindex)
  
          Sentences are separated by blank lines. A corresponding list of
          Penn Treebank formatted trees must be provided as well."""
          stream = iter(stream)
          corpus = this_class()
          for tree in trees:
              sentence = Sentence.from_stanford_dependencies(stream,
                                                             tree,
                                                             include_erased,
                                                             include_punct)
              corpus.append(sentence)
          return corpus