s1 = {4, 1, 9, 6}
print(s1)            # print the original set
print(id(s1))        # address of s1

s1.add(0)   	     # add 0 to the set
s1.add(10)  	     # add 10 to the set

print(s1)            # print the modified set
print(id(s1))        # as sets are mutable objects, the address of s1 remains the same

s1.remove(0)   	     # remove 0 from the set
s1.remove(6)   	     # remove 6 from the set

print(s1)    	     # print s1 again