*1:https://www.maruhan.co.jp/ See eg. https://ja.wikipedia.org/wiki/%E3%83%9E%E3%83%AB%E3%83%8F%E3%83%B3
*2:See also https://sumita-m.hatenadiary.com/entry/2020/02/10/160701 https://sumita-m.hatenadiary.com/entry/2020/03/04/022634 https://sumita-m.hatenadiary.com/entry/2020/03/06/095341 https://sumita-m.hatenadiary.com/entry/2020/03/11/103446 https://sumita-m.hatenadiary.com/entry/2020/12/08/110922 https://sumita-m.hatenadiary.com/entry/2021/01/18/011520 https://sumita-m.hatenadiary.com/entry/2022/02/14/012406 https://sumita-m.hatenadiary.com/entry/2022/02/19/081108 https://sumita-m.hatenadiary.com/entry/2022/08/21/112319
