*1:See also https://sumita-m.hatenadiary.com/entry/2020/08/14/091741 https://sumita-m.hatenadiary.com/entry/2020/09/05/170400 https://sumita-m.hatenadiary.com/entry/2021/01/27/083235 https://sumita-m.hatenadiary.com/entry/2021/06/03/073508 https://sumita-m.hatenadiary.com/entry/2021/06/28/010650 https://sumita-m.hatenadiary.com/entry/2021/07/02/213914
