input: Write a python function to remove duplicates from a list.
  assert removeDuplicates([1, 3, 5, 4, 6, 3, 5, 4]) == [1, 3, 5, 4, 6]
  assert removeDuplicates([10, 20, 10, 30, 40, 30, 50]) == [10, 20, 30, 40, 50]
  assert removeDuplicates([1, 1, 1, 1, 1]) == [1]
output: def removeDuplicates(lst):
      seen = set()
      result = []
      for item in lst:
          if item not in seen:
              seen.add(item)
              result.append(item)
      return result