*1:http://www.wako.co.jp/ See eg. https://ja.wikipedia.org/wiki/%E5%92%8C%E5%85%89_(%E5%95%86%E6%A5%AD%E6%96%BD%E8%A8%AD) See also https://sumita-m.hatenadiary.com/entry/20111115/1321286931
*2:See also https://sumita-m.hatenadiary.com/entry/20081028/1225205805 https://sumita-m.hatenadiary.com/entry/2020/03/02/011405 https://sumita-m.hatenadiary.com/entry/2020/08/05/102533 https://sumita-m.hatenadiary.com/entry/2020/11/14/164535 https://sumita-m.hatenadiary.com/entry/2021/03/03/010412 https://sumita-m.hatenadiary.com/entry/2021/03/21/084125 https://sumita-m.hatenadiary.com/entry/2021/03/25/072032 https://sumita-m.hatenadiary.com/entry/2021/03/28/211305 https://sumita-m.hatenadiary.com/entry/2021/04/01/095108 https://sumita-m.hatenadiary.com/entry/2021/06/21/015143 https://sumita-m.hatenadiary.com/entry/2021/09/17/065335 https://sumita-m.hatenadiary.com/entry/2021/10/28/082219 https://sumita-m.hatenadiary.com/entry/2022/01/24/014500
