在bilibili上看到的可能的组法
http://www.bilibili.com/video/av45918117?p=4&share_medium=android&share_source=copy_link&bbid=CF3529A5-BE7B-4926-BB5B-6BBB360AE406155378infoc&ts=1552412189885
http://www.bilibili.com/video/av45918117?p=4&share_medium=android&share_source=copy_link&bbid=CF3529A5-BE7B-4926-BB5B-6BBB360AE406155378infoc&ts=1552412189885