*1:See also https://sumita-m.hatenadiary.com/entry/2020/01/07/090230 https://sumita-m.hatenadiary.com/entry/2020/02/05/083403 https://sumita-m.hatenadiary.com/entry/2020/02/23/081342 https://sumita-m.hatenadiary.com/entry/2020/03/10/085939 https://sumita-m.hatenadiary.com/entry/2020/06/04/082300 https://sumita-m.hatenadiary.com/entry/2020/06/13/082409 https://sumita-m.hatenadiary.com/entry/2020/07/21/000200 https://sumita-m.hatenadiary.com/entry/2020/08/25/123127 https://sumita-m.hatenadiary.com/entry/2020/10/17/134909