How to take list(set(aList)) values as per original occurrence order of the list(aList)?

Question

I have a list:

lst=[1,1,2,2,3,3,4,4]

After this code:

lst = list(set(lst))

print(lst)

I get this output:

[1, 2, 3, 4]

Also, I have another list:

lst=[6,6,7,7,8,8,9,9]

After this code:

lst = list(set(lst))

print(lst)

I get this output

[8, 9, 6, 7]

This output is not in the original order of the list ([6,7,8,9]). But I expected to get this order.

Also, I have a another list:

lst=[6,6,7,7,8,8,9,9,1,1]

After this code:

lst = list(set(lst))

print(lst)

I get this output:

[1, 6, 7, 8, 9]

But I want the output as [6, 7, 8, 9, 1].

So my question is: how can I take the set of a list while retaining the original order order of list? Thanks in advance.