*1:See also https://sumita-m.hatenadiary.com/entry/2020/08/04/001223 https://sumita-m.hatenadiary.com/entry/2020/08/06/073206 https://sumita-m.hatenadiary.com/entry/2020/08/09/015405 https://sumita-m.hatenadiary.com/entry/2020/08/11/125114 https://sumita-m.hatenadiary.com/entry/2020/08/15/161617 https://sumita-m.hatenadiary.com/entry/2020/08/19/083210 https://sumita-m.hatenadiary.com/entry/2020/08/26/011502 https://sumita-m.hatenadiary.com/entry/2020/09/17/014740 https://sumita-m.hatenadiary.com/entry/2020/10/02/085220 https://sumita-m.hatenadiary.com/entry/2021/02/26/021432