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
  
  ### Example:
  # for removeDuplicates(['a', 'b', 'a', 'c', 'c', 'd']) == ['a', 'b', 'c', 'd']
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