*1:See also https://sumita-m.hatenadiary.com/entry/20140711/1405094251 https://sumita-m.hatenadiary.com/entry/2021/10/31/104007 https://sumita-m.hatenadiary.com/entry/2021/11/10/095942 https://sumita-m.hatenadiary.com/entry/2021/11/14/121256
*2:See also https://sumita-m.hatenadiary.com/entry/2020/02/18/094627 https://sumita-m.hatenadiary.com/entry/2020/11/10/014804 https://sumita-m.hatenadiary.com/entry/2021/07/03/114031