*1:See also https://sumita-m.hatenadiary.com/entry/20060803/1154628184 https://sumita-m.hatenadiary.com/entry/20081011/1223696156 https://sumita-m.hatenadiary.com/entry/20141127/1417023558 https://sumita-m.hatenadiary.com/entry/2020/02/01/083510 https://sumita-m.hatenadiary.com/entry/2020/07/08/004704 https://sumita-m.hatenadiary.com/entry/2020/07/12/014545 https://sumita-m.hatenadiary.com/entry/2020/07/20/090531 https://sumita-m.hatenadiary.com/entry/2020/07/23/083225
*2:See also https://sumita-m.hatenadiary.com/entry/2020/04/06/014410 https://sumita-m.hatenadiary.com/entry/2020/05/25/082501