*1:See eg. https://maruchiba.jp/sys/data/index/page/id/3295
*2:See also https://sumita-m.hatenadiary.com/entry/2019/07/01/111535 https://sumita-m.hatenadiary.com/entry/2020/02/25/000332 https://sumita-m.hatenadiary.com/entry/2020/05/23/100331 https://sumita-m.hatenadiary.com/entry/2020/05/28/141603 https://sumita-m.hatenadiary.com/entry/2020/06/14/005403 https://sumita-m.hatenadiary.com/entry/2020/07/18/112140 https://sumita-m.hatenadiary.com/entry/2020/08/07/145358 https://sumita-m.hatenadiary.com/entry/2020/10/22/101226