code: def _get_index_of_lcs(x, y):
      return len(x), len(y)
  
file_path: sumy/sumy/evaluation/rouge.py
imports: from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  from ..models.dom import Sentence
label_desc: Use image node_id 4 for calling a global function with example usage: _get_index_of_lcs(x, y) and returns: len,  len