*1:See also https://sumita-m.hatenadiary.com/entry/2020/01/15/103151 https://sumita-m.hatenadiary.com/entry/2020/07/01/130653 https://sumita-m.hatenadiary.com/entry/2020/11/10/213903 https://sumita-m.hatenadiary.com/entry/2021/02/19/085644 https://sumita-m.hatenadiary.com/entry/2021/05/02/094430 https://sumita-m.hatenadiary.com/entry/2021/05/07/225351 https://sumita-m.hatenadiary.com/entry/2021/11/12/105819 https://sumita-m.hatenadiary.com/entry/2021/12/02/132100
