a = set()
#adding values to an empty set
a.add(4)
a.add(5)
#a.add([5,7,9]) #list cannot be added 
#a.add((4,5,6)) #only tuples can be add in a set
#a.add({5:7})# dictionaries cannot be added
# print(len(a))
# a.remove(5)
# print(a)

#clear
# a.clear()
# print(a)

#pop()  pop method removes randon element from set .
# b = {"vikas","taj","mohit","pn"}
# b.pop()
# print(b)

