*1:See also https://sumita-m.hatenadiary.com/entry/2020/02/02/100650 https://sumita-m.hatenadiary.com/entry/2020/03/05/033241 https://sumita-m.hatenadiary.com/entry/2020/03/20/082810 https://sumita-m.hatenadiary.com/entry/2020/05/11/141631 https://sumita-m.hatenadiary.com/entry/2020/05/15/142141 https://sumita-m.hatenadiary.com/entry/2020/06/10/074951 https://sumita-m.hatenadiary.com/entry/2020/06/26/012426 https://sumita-m.hatenadiary.com/entry/2020/07/06/094945
