*1:See also https://sumita-m.hatenadiary.com/entry/2020/02/05/084307 https://sumita-m.hatenadiary.com/entry/2020/06/23/110424 https://sumita-m.hatenadiary.com/entry/2020/07/08/212010 https://sumita-m.hatenadiary.com/entry/2020/07/31/020619 https://sumita-m.hatenadiary.com/entry/2020/08/06/005528 https://sumita-m.hatenadiary.com/entry/2020/08/12/225308 https://sumita-m.hatenadiary.com/entry/2021/03/12/080535
