code: def get_kwic(tokens, index, context_window=5):
      
      text_length = len(tokens)
      start_before = max(0, index-context_window)
      end_before = max(0, index)
      before = tokens[start_before:end_before]
      start_after = min(text_length, index+1)
      end_after = min(text_length, index+context_window+1)
      after = tokens[start_after:end_after]
      return before, tokens[index], after
docs: keyword in context
  
      Parameters
      ----------
      tokens : list of str
          a text represented as a list of tokens
      index : int
          the index of the keyword in the token list
      context_window : int
          the number of preceding/succeding words of the keyword to be
          retrieved
  
      Returns
      -------
      before : list of str
          the tokens preceding the keyword
      keyword : str
          the token at the index position
      after : list of str
          the tokens succeding the keyword