*1:See also https://sumita-m.hatenadiary.com/entry/2020/06/27/020445 https://sumita-m.hatenadiary.com/entry/2020/08/27/022023 https://sumita-m.hatenadiary.com/entry/2020/11/18/141042 https://sumita-m.hatenadiary.com/entry/2020/11/23/214829 https://sumita-m.hatenadiary.com/entry/2020/11/28/091449 https://sumita-m.hatenadiary.com/entry/2021/01/31/132029 https://sumita-m.hatenadiary.com/entry/2021/08/05/080446 https://sumita-m.hatenadiary.com/entry/2021/11/18/142542
