a={10,20,30,40,50}
print(a)
a.add(60)
print(a)
y=a.copy()
print(y)
a.remove(20)
print(a)
a.pop()
print(a)
a.discard(30)
print(a)
a.clear()
print(a)
b=[10,20,30,20,10,30]
print(b)
c=set(b)
print(c)
print(b)
