*1:See also https://sumita-m.hatenadiary.com/entry/2019/09/20/084439
*2:See also https://sumita-m.hatenadiary.com/entry/20060318/1142726680 https://sumita-m.hatenadiary.com/entry/20060831/1157027021 https://sumita-m.hatenadiary.com/entry/20080828/1219933079 https://sumita-m.hatenadiary.com/entry/20080904/1220461993 https://sumita-m.hatenadiary.com/entry/20090525/1243218089 https://sumita-m.hatenadiary.com/entry/20120111/1326208449 https://sumita-m.hatenadiary.com/entry/20131003/1380810668 https://sumita-m.hatenadiary.com/entry/20131209/1386614003 https://sumita-m.hatenadiary.com/entry/20150518/1431967461 https://sumita-m.hatenadiary.com/entry/20171009/1507565550 https://sumita-m.hatenadiary.com/entry/20171211/1512960999 https://sumita-m.hatenadiary.com/entry/20180124/1516764209 https://sumita-m.hatenadiary.com/entry/20180306/1520296372 https://sumita-m.hatenadiary.com/entry/20180311/1520732272 https://sumita-m.hatenadiary.com/entry/20180522/1526953452 https://sumita-m.hatenadiary.com/entry/20180629/1530242801 https://sumita-m.hatenadiary.com/entry/20180925/1537856475 https://sumita-m.hatenadiary.com/entry/2019/02/07/010934 https://sumita-m.hatenadiary.com/entry/2019/04/25/100314 https://sumita-m.hatenadiary.com/entry/2019/08/30/103919 https://sumita-m.hatenadiary.com/entry/2019/08/31/022507 https://sumita-m.hatenadiary.com/entry/2019/09/05/235902 https://sumita-m.hatenadiary.com/entry/2019/09/19/111811 https://sumita-m.hatenadiary.com/entry/2020/01/17/142016
