*1:See also https://sumita-m.hatenadiary.com/entry/20160128/1454000440 https://sumita-m.hatenadiary.com/entry/2020/02/03/103223 https://sumita-m.hatenadiary.com/entry/2023/03/19/133133
*2:See also https://sumita-m.hatenadiary.com/entry/2021/06/06/073943 https://sumita-m.hatenadiary.com/entry/2022/12/14/144252
