Python program which removes duplicates from a list of lists

Question

for ex:-
list1 = [[1,2],[1,2],[3,4],[7,9]]

output list should be

[[3,4],[7,9]]

Don't use inbuilt functions like count.
Must use index in loops.

Answer 1

https://code.sololearn.com/c836zfebFrKe/?ref=app

Answer 2

Ok, no count
https://code.sololearn.com/cE5IT0EJuDw9/?ref=app

Answer 3

@Louis Without count function.