如何从三维列表中删除重复项？

def remove_duplicates(lst):
    seen = set()
    result = []
    for sublist in lst:
        for item in sublist:
            # 将元素转换为元组
            item_tuple = tuple(item)
            # 检查元素是否已经存在于集合中
            if item_tuple not in seen:
                seen.add(item_tuple)
                result.append(item)
    return result

# 示例用法
lst = [[[1, 2], [3, 4]], [[1, 2], [5, 6]], [[7, 8], [9, 10]], [[1, 2], [3, 4]]]
result = remove_duplicates(lst)
print(result)

[[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]]