Write a Python function that takes a list as input and returns a new list with only the unique elements from the input list. The new list should maintain the order of elements as they originally appeared in the input list.
Example 1:
Input: [1, 2, 2, 3, 4, 4, 4, 5] Output: [1, 2, 3, 4, 5]
Example 2:
Input: ['a', 'b', 'b', 'c', 'a', 'd', 'e', 'e'] Output: ['a', 'b', 'c', 'd', 'e']
Consider using a different data structure to store the unique elements.
def unique_list(lst):
seen = []
for item in lst:
if item not in seen:
seen.append(item)
return seen
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