How to combine two lists while removing duplicates in the new list and keeping duplicates in original list in Python code example

Example 1: how to make python remove the duplicates in list

mylist = ["a", "b", "a", "c", "c"]
mylist = list(dict.fromkeys(mylist))

  print(mylist)

Example 2: remove duplicates from a list of lists python

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