*1:See also https://sumita-m.hatenadiary.com/entry/2020/04/27/085627 https://sumita-m.hatenadiary.com/entry/2020/07/13/190557 https://sumita-m.hatenadiary.com/entry/2020/10/16/102854 https://sumita-m.hatenadiary.com/entry/2020/12/20/085730 https://sumita-m.hatenadiary.com/entry/2021/01/24/142558 https://sumita-m.hatenadiary.com/entry/2021/11/29/182833 https://sumita-m.hatenadiary.com/entry/2021/12/16/104126