*1:See also https://sumita-m.hatenadiary.com/entry/20151214/1450066899 https://sumita-m.hatenadiary.com/entry/20160820/1471623058 https://sumita-m.hatenadiary.com/entry/20160913/1473739802 https://sumita-m.hatenadiary.com/entry/20160916/1474036064 https://sumita-m.hatenadiary.com/entry/2019/04/06/102306 https://sumita-m.hatenadiary.com/entry/2020/12/18/094009 https://sumita-m.hatenadiary.com/entry/2021/01/24/155158 https://sumita-m.hatenadiary.com/entry/2022/02/24/091746
