def remove_duplicates_list(raw_list):
    """Return a list with just unique items.
    
    Only works with a list of items, not with nested lists.
    
    Args:
        raw_list (list): List with duplicate items.
        
    Returns:
        unique_list (list):: List with only one instance of each item.
    """
    my_set = set(raw_list)
    unique_list = list(my_set)
    return unique_list