*1:See also https://sumita-m.hatenadiary.com/entry/20081028/1225205805 https://sumita-m.hatenadiary.com/entry/20150224/1424706062 https://sumita-m.hatenadiary.com/entry/20151118/1447863610 https://sumita-m.hatenadiary.com/entry/20160122/1453458721 https://sumita-m.hatenadiary.com/entry/20161019/1476851625 https://sumita-m.hatenadiary.com/entry/20170410/1491791398 https://sumita-m.hatenadiary.com/entry/2021/03/21/084125 https://sumita-m.hatenadiary.com/entry/2021/03/29/213503 https://sumita-m.hatenadiary.com/entry/2021/09/08/163139 https://sumita-m.hatenadiary.com/entry/2021/12/04/083102 https://sumita-m.hatenadiary.com/entry/2022/01/06/102900 https://sumita-m.hatenadiary.com/entry/2022/01/10/103939 https://sumita-m.hatenadiary.com/entry/2022/01/24/014500
