*1:See also https://sumita-m.hatenadiary.com/entry/2019/10/08/112455 https://sumita-m.hatenadiary.com/entry/2019/10/28/100855 https://sumita-m.hatenadiary.com/entry/2019/11/08/085050 https://sumita-m.hatenadiary.com/entry/2019/11/15/030331 https://sumita-m.hatenadiary.com/entry/2019/12/03/005744 https://sumita-m.hatenadiary.com/entry/2020/01/01/123253 https://sumita-m.hatenadiary.com/entry/2020/01/10/160055 https://sumita-m.hatenadiary.com/entry/2020/01/14/094848 https://sumita-m.hatenadiary.com/entry/2020/01/14/101354 https://sumita-m.hatenadiary.com/entry/2020/01/15/103151 https://sumita-m.hatenadiary.com/entry/2020/01/16/084538