*1:See also https://sumita-m.hatenadiary.com/entry/20130413/1365875653 https://sumita-m.hatenadiary.com/entry/2020/03/21/025302 https://sumita-m.hatenadiary.com/entry/2021/03/22/134358 https://sumita-m.hatenadiary.com/entry/2021/12/17/110550 https://sumita-m.hatenadiary.com/entry/2021/12/26/080412 https://sumita-m.hatenadiary.com/entry/2022/12/14/095113 https://sumita-m.hatenadiary.com/entry/2022/12/28/095133
