*1:See also https://sumita-m.hatenadiary.com/entry/20170321/1490117707 https://sumita-m.hatenadiary.com/entry/20170511/1494477182 https://sumita-m.hatenadiary.com/entry/2020/01/11/024638 https://sumita-m.hatenadiary.com/entry/2020/02/15/214804 https://sumita-m.hatenadiary.com/entry/2020/06/01/221341 https://sumita-m.hatenadiary.com/entry/2020/06/25/090450 https://sumita-m.hatenadiary.com/entry/2020/09/02/215451 https://sumita-m.hatenadiary.com/entry/2020/10/04/093914 https://sumita-m.hatenadiary.com/entry/2020/11/01/101500 https://sumita-m.hatenadiary.com/entry/2021/03/11/082343