a=frozenset(['dog','apple',1,'dog',2,3,'apple',4,5,6,'dog',1,1,2,2,3,4,2,3,1]) print(a) b={'cat',7,8,1,2} union=a|b print(union) intersection=a&b print(intersection) # AttributeError : 'fozenset' object has no attribute 'remove' # intersection.remove(1) print(intersection)