*1:See also https://sumita-m.hatenadiary.com/entry/2020/07/25/215456 https://sumita-m.hatenadiary.com/entry/2020/11/07/101809
*2:See also https://sumita-m.hatenadiary.com/entry/2020/06/27/020445 https://sumita-m.hatenadiary.com/entry/2020/08/27/022023 https://sumita-m.hatenadiary.com/entry/2020/11/18/141042