code: def valid_keys():
      return hypothesis.strategies.sampled_from(VALID_KEYS)
  
imports: import contextlib
  import datetime
  import os
  import pickle
  import unittest
  import zoneinfo
  from test.support.hypothesis_helper import hypothesis
  import test.test_zoneinfo._support
label_desc: Use image node_id 2 for calling a global function with example usage: valid_keys() and returns: hypothesis