*1:See also https://sumita-m.hatenadiary.com/entry/20070108/1168229799 https://sumita-m.hatenadiary.com/entry/20100907/1283879394 https://sumita-m.hatenadiary.com/entry/20150407/1428337714 https://sumita-m.hatenadiary.com/entry/20160828/1472399796 https://sumita-m.hatenadiary.com/entry/2019/09/07/080148 https://sumita-m.hatenadiary.com/entry/2020/10/11/010256 https://sumita-m.hatenadiary.com/entry/2020/11/09/140633 https://sumita-m.hatenadiary.com/entry/2020/11/14/164535 https://sumita-m.hatenadiary.com/entry/2021/01/07/091126 https://sumita-m.hatenadiary.com/entry/2021/01/09/235906 https://sumita-m.hatenadiary.com/entry/2021/01/12/091129 https://sumita-m.hatenadiary.com/entry/2021/03/27/074834 https://sumita-m.hatenadiary.com/entry/2021/04/07/094031 https://sumita-m.hatenadiary.com/entry/2021/04/12/104024 https://sumita-m.hatenadiary.com/entry/2021/06/23/090149
