まとめ https://www.youtube.com/watch?v=2rNsUlx4mBY&t=7shttps://www.youtube.com/watch?v=YkFt8wSlw8g&t=15shttps://www.youtube.com/watch?v=GIacvhtPC-0
http://www.nicovideo.jp/watch/sm32977834
