input: Write a python function to remove duplicates from a list.
  assert removeDuplicates([1, 4, 4, 4, 5, 5, 5, 6, 7]) == [1, 4, 5, 6, 7]
  assert removeDuplicates([1, 1, 2, 2, 3, 3, 4, 4]) == [1, 2, 3, 4]
  assert removeDuplicates([7, 7, 6, 5, 5, 4, 4, 3, 2, 1, 1]) == [7, 6, 5, 4, 3, 2, 1]
  assert removeDuplicates([]) == []
  assert removeDuplicates([1]) == [1]
output: def removeDuplicates(lst):
      return list(dict.fromkeys(lst))