input: Write a Python program that removes duplicates from a list.
  
  ### Instruction:
  Write a function to remove duplicates from a given list and return the list with unique elements in the original order.
  
  def remove_duplicates(my_list):
   return list(dict.fromkeys(my_list))
  
  assert remove_duplicates([1, 2, 3, 4, 3, 2, 1])==[1, 2, 3, 4]
  assert remove_duplicates([5, 5, 6, 7, 6, 8])==[5, 6, 7, 8]
  assert remove_duplicates([10, 10, 10, 10])==[10]
  assert remove_duplicates([])==[]
output: def remove_duplicates(my_list):
      return list(dict.fromkeys(my_list))