*1:See also https://sumita-m.hatenadiary.com/entry/2020/01/15/092809 https://sumita-m.hatenadiary.com/entry/2020/02/18/012709 https://sumita-m.hatenadiary.com/entry/2020/03/13/111351 https://sumita-m.hatenadiary.com/entry/2020/03/25/092117 https://sumita-m.hatenadiary.com/entry/2020/04/10/102333 https://sumita-m.hatenadiary.com/entry/2020/05/16/152546 https://sumita-m.hatenadiary.com/entry/2020/06/24/194442 https://sumita-m.hatenadiary.com/entry/2020/07/23/140730 https://sumita-m.hatenadiary.com/entry/2020/11/07/015638 https://sumita-m.hatenadiary.com/entry/2020/11/11/020216 https://sumita-m.hatenadiary.com/entry/2020/11/18/091524 https://sumita-m.hatenadiary.com/entry/2021/01/24/142558 https://sumita-m.hatenadiary.com/entry/2021/05/06/025059