*1:See also https://sumita-m.hatenadiary.com/entry/2020/07/19/165757 https://sumita-m.hatenadiary.com/entry/2020/08/25/104513 https://sumita-m.hatenadiary.com/entry/2021/04/09/083052 https://sumita-m.hatenadiary.com/entry/2021/04/30/095451 https://sumita-m.hatenadiary.com/entry/2021/05/15/090950 https://sumita-m.hatenadiary.com/entry/2021/06/10/230544 https://sumita-m.hatenadiary.com/entry/2021/06/19/094341 https://sumita-m.hatenadiary.com/entry/2021/07/13/005944 https://sumita-m.hatenadiary.com/entry/2021/10/09/123758 https://sumita-m.hatenadiary.com/entry/2021/10/23/104501