*1:See also https://sumita-m.hatenadiary.com/entry/20090111/1231603370 https://sumita-m.hatenadiary.com/entry/20100324/1269430030 https://sumita-m.hatenadiary.com/entry/20100901/1283368431 https://sumita-m.hatenadiary.com/entry/20140613/1402658425 https://sumita-m.hatenadiary.com/entry/20150420/1429499344 https://sumita-m.hatenadiary.com/entry/20150706/1436200123 https://sumita-m.hatenadiary.com/entry/20150711/1436580943 https://sumita-m.hatenadiary.com/entry/20150723/1437656300 https://sumita-m.hatenadiary.com/entry/20150727/1437924081 https://sumita-m.hatenadiary.com/entry/20161002/1475384800 https://sumita-m.hatenadiary.com/entry/20170130/1485785620 https://sumita-m.hatenadiary.com/entry/20170608/1496938754 https://sumita-m.hatenadiary.com/entry/20170719/1500483791
