*1:See also https://sumita-m.hatenadiary.com/entry/20160504/1462387429 https://sumita-m.hatenadiary.com/entry/2019/07/16/015650 https://sumita-m.hatenadiary.com/entry/2020/02/14/014731 https://sumita-m.hatenadiary.com/entry/2020/06/18/075858 https://sumita-m.hatenadiary.com/entry/2020/07/13/014001 https://sumita-m.hatenadiary.com/entry/2021/06/18/095542 https://sumita-m.hatenadiary.com/entry/2021/07/28/091656 https://sumita-m.hatenadiary.com/entry/2021/07/31/092857 https://sumita-m.hatenadiary.com/entry/2021/08/03/072451