*1:See also https://sumita-m.hatenadiary.com/entry/20140723/1406083089 https://sumita-m.hatenadiary.com/entry/20160811/1470841490 https://sumita-m.hatenadiary.com/entry/20170316/1489632241 https://sumita-m.hatenadiary.com/entry/20180729/1532792091 https://sumita-m.hatenadiary.com/entry/2020/02/09/094400 https://sumita-m.hatenadiary.com/entry/2021/08/07/145606 https://sumita-m.hatenadiary.com/entry/2021/09/07/081030
