code: def data_missing_for_sorting():
      """
      Length-3 array with a known sort order.
  
      This should be three items [B, NA, A] with
      A < B and NA missing.
      """
      raise NotImplementedError
  
imports: import operator
  import pytest
  from pandas._config.config import _get_option
  from pandas import Series, options
label_desc: Use image node_id 8 for calling a global function with example usage: data_missing_for_sorting() without return types