input: Write a function to remove duplicates from a list and return the result as a list.
  assert remove_duplicates([1, 2, 3, 4, 5, 2, 3]) == [1, 2, 3, 4, 5]
  assert remove_duplicates([10, 20, 10, 30, 20]) == [10, 20, 30]
  assert remove_duplicates([7, 8, 7, 9, 8, 10]) == [7, 8, 9, 10]
output: def remove_duplicates(lst):
      return list(dict.fromkeys(lst))