https://www.youtube.com/watch?v=3IxNDZrpOlc&feature=emb_imp_woyt テキスト版 https://docs.google.com/document/d/e/2PACX-1vQ6TEGErv3Mvb45Q34k4yUczwRjc3qvydXaDZ2g9ZUXGWNZ9Xy39y2JRyR6mVKtfmdjPRegMByVy75Y/pub
http://www.nicovideo.jp/watch/sm40028599
