numpy for no repeating for two columns

Question

import numpy as np
df2 = pd.DataFrame({ 
  \'A\': np.array([1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0,  0, 0], dtype=\'int32\'),
  \'B\': np.array([0, 0, 0, 0, 1, 0, 0, 1, 1,