*1:See also https://sumita-m.hatenadiary.com/entry/2019/12/02/001041 https://sumita-m.hatenadiary.com/entry/2020/01/16/024951 https://sumita-m.hatenadiary.com/entry/2020/02/13/210049 https://sumita-m.hatenadiary.com/entry/2020/03/02/005806 https://sumita-m.hatenadiary.com/entry/2020/03/20/005216 https://sumita-m.hatenadiary.com/entry/2020/10/18/005053 https://sumita-m.hatenadiary.com/entry/2021/05/17/081247 https://sumita-m.hatenadiary.com/entry/2021/07/22/094413
