*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 https://sumita-m.hatenadiary.com/entry/2021/12/20/071613
*2:See also https://sumita-m.hatenadiary.com/entry/20181101/1541037163 https://sumita-m.hatenadiary.com/entry/2023/09/17/153946
