*1:See also https://sumita-m.hatenadiary.com/entry/2020/01/26/110003 https://sumita-m.hatenadiary.com/entry/2020/02/03/090355 https://sumita-m.hatenadiary.com/entry/2020/02/17/131705 https://sumita-m.hatenadiary.com/entry/2020/04/29/112822 https://sumita-m.hatenadiary.com/entry/2020/06/10/085835 https://sumita-m.hatenadiary.com/entry/2020/06/11/094620 https://sumita-m.hatenadiary.com/entry/2020/06/16/090846 https://sumita-m.hatenadiary.com/entry/2020/06/19/083232 https://sumita-m.hatenadiary.com/entry/2020/06/27/080316 https://sumita-m.hatenadiary.com/entry/2020/10/21/100123