*1:See also https://sumita-m.hatenadiary.com/entry/2020/05/04/025138 https://sumita-m.hatenadiary.com/entry/2020/08/29/141551
*2:See also https://sumita-m.hatenadiary.com/entry/2019/08/20/073933 https://sumita-m.hatenadiary.com/entry/2020/03/19/023253 https://sumita-m.hatenadiary.com/entry/2020/05/09/103607 https://sumita-m.hatenadiary.com/entry/2020/07/22/153200 https://sumita-m.hatenadiary.com/entry/2020/07/25/215456 https://sumita-m.hatenadiary.com/entry/2020/07/28/234952 https://sumita-m.hatenadiary.com/entry/2020/09/08/101928 https://sumita-m.hatenadiary.com/entry/2020/09/16/122823 https://sumita-m.hatenadiary.com/entry/2020/09/18/022123