*1:See also https://sumita-m.hatenadiary.com/entry/2020/06/02/175314 https://sumita-m.hatenadiary.com/entry/2020/07/06/092410 https://sumita-m.hatenadiary.com/entry/2021/01/05/093413 https://sumita-m.hatenadiary.com/entry/2021/01/07/134356 https://sumita-m.hatenadiary.com/entry/2021/09/29/131340 https://sumita-m.hatenadiary.com/entry/2021/10/13/082558 https://sumita-m.hatenadiary.com/entry/2021/11/05/121806
