input: def removeDuplicates(arr):
      result = []
      
      # traverse for all elements 
      for i in arr:
          
          # check if exists in result 
          if i not in result:
              result.append(i)
              
      # return result 
      return result
  
  """
  >>> removeDuplicates(['a', 'b', 'a', 'c', 'c', 'd'])
  ['a', 'b', 'c', 'd']
  >>> removeDuplicates(['apple', 'banana', 'apple', 'banana', 'cherry'])
  ['apple', 'banana', 'cherry']
  """
output:     result = []
      
      # traverse for all elements 
      for i in arr:
          
          # check if exists in result 
          if i not in result:
              result.append(i)
              
      # return result 
      return result