remove duplicates from a list of lists python

1mylist = ["a", "b", "b", "c", "a"]
2mylist = sorted(set(mylist))
3print(mylist)

1# removing duplicated from the list using naive methods 
2
3# initializing list 
4sam_list = [11, 13, 15, 16, 13, 15, 16, 11] 
5print ("The list is: " + str(sam_list)) 
6
7# remove duplicated from list 
8result = [] 
9for i in sam_list: 
10    if i not in result: 
11        result.append(i) 
12
13# printing list after removal 
14print ("The list after removing duplicates : " + str(result)) 
15

1k = [[1, 2], [4], [5, 6, 2], [1, 2], [3], [4]]
2new_k = []
3for elem in k:
4    if elem not in new_k:
5        new_k.append(elem)
6k = new_k
7print k
8# prints [[1, 2], [4], [5, 6, 2], [3]]