name = set()
name.add("Peter")
print(name)
name.add("Rose")
print(name)
name.remove("Peter")
print("Peter" in name)
name.add("Williams")
name.add("Cat")
name.add("dog")
print(name)
4130653f2d88111ca513a8e4c1ade2142a37273f
<mask token>

<mask token>
name.add('Peter')
print(name)
name.add('Rose')
print(name)
name.remove('Peter')
print('Peter' in name)
name.add('Williams')
name.add('Cat')
name.add('dog')
print(name)

name = set()
name.add('Peter')
print(name)
name.add('Rose')
print(name)
name.remove('Peter')
print('Peter' in name)
name.add('Williams')
name.add('Cat')
name.add('dog')
print(name)

name = set()
name.add("Peter")
print(name)
name.add("Rose")
print(name)
name.remove("Peter")
print("Peter" in name)
name.add("Williams")
name.add("Cat")
name.add("dog")
print(name)