*1:See also https://sumita-m.hatenadiary.com/entry/2020/01/20/102733 https://sumita-m.hatenadiary.com/entry/2020/01/27/085604 https://sumita-m.hatenadiary.com/entry/2020/01/30/222913 https://sumita-m.hatenadiary.com/entry/2020/03/08/004041 https://sumita-m.hatenadiary.com/entry/2020/07/02/003045 https://sumita-m.hatenadiary.com/entry/2020/07/14/095720 https://sumita-m.hatenadiary.com/entry/2021/02/09/133328
