*1:See also https://sumita-m.hatenadiary.com/entry/2020/02/02/100650 https://sumita-m.hatenadiary.com/entry/2020/03/11/133543 https://sumita-m.hatenadiary.com/entry/2020/03/24/160033 https://sumita-m.hatenadiary.com/entry/2020/04/29/112822 https://sumita-m.hatenadiary.com/entry/2020/05/04/133542 https://sumita-m.hatenadiary.com/entry/2020/06/04/124226 https://sumita-m.hatenadiary.com/entry/2020/06/08/083827