def get_unique_list_values(list_to_review): 
    """Helper function, takes in a list as a single argument and returns a unique list.
    """    
    unique_list = [] 
      
    # traverse for all elements 
    for item in list_to_review: 
        # check if exists in unique_list or not 
        if item not in unique_list: 
            unique_list.append(item) 

    return unique_list