code: def everygram_input():
      """Form test data for tests."""
      return iter(["a", "b", "c"])
  
file_path: nltk/nltk/test/unit/test_util.py
imports: import pytest
  from nltk.util import everygrams
label_desc: Use image node_id 1 for calling a global function with example usage: everygram_input() and returns: iter