def keep_last_occurrences(lst, key):
    seen = set()
    for idx in reversed(range(len(lst))):
        item = lst[idx]
        k = key(item)
        if k in seen:
            del lst[idx]
        else:
            seen.add(k)
    return lst

def delete_duplicate_styles(list_styles_to_update, different_styles):
    for s in list_styles_to_update:
        for d in different_styles:
            if s["doc"].name == d["doc"].name and s["list_style"].split(" : ")[0] == d["style"].name:
                different_styles.remove(d)
    return different_styles