*1:See also https://sumita-m.hatenadiary.com/entry/2019/08/20/073933 https://sumita-m.hatenadiary.com/entry/2020/03/19/023253 https://sumita-m.hatenadiary.com/entry/2020/05/09/103607 https://sumita-m.hatenadiary.com/entry/2020/07/22/153200 https://sumita-m.hatenadiary.com/entry/2020/07/25/215456 https://sumita-m.hatenadiary.com/entry/2020/07/28/234952