*1:See also https://sumita-m.hatenadiary.com/entry/20071020/1192846221 https://sumita-m.hatenadiary.com/entry/20071106/1194327284 https://sumita-m.hatenadiary.com/entry/20160718/1468776284 https://sumita-m.hatenadiary.com/entry/20160729/1469806056 https://sumita-m.hatenadiary.com/entry/20161101/1478018802 https://sumita-m.hatenadiary.com/entry/2019/02/17/013750 https://sumita-m.hatenadiary.com/entry/2020/04/30/105949
*2:See also https://sumita-m.hatenadiary.com/entry/2020/08/29/135133 https://sumita-m.hatenadiary.com/entry/2021/05/20/080915 https://sumita-m.hatenadiary.com/entry/2021/05/28/021659 https://sumita-m.hatenadiary.com/entry/2021/05/31/023942 https://sumita-m.hatenadiary.com/entry/2021/10/25/111403
