*1:See also https://sumita-m.hatenadiary.com/entry/2020/07/13/122536
*2:See also https://sumita-m.hatenadiary.com/entry/2020/02/20/212628 https://sumita-m.hatenadiary.com/entry/2020/03/06/095341 https://sumita-m.hatenadiary.com/entry/2020/05/04/025138 https://sumita-m.hatenadiary.com/entry/2020/05/26/090808 https://sumita-m.hatenadiary.com/entry/2020/06/02/175314 https://sumita-m.hatenadiary.com/entry/2020/06/23/002122 https://sumita-m.hatenadiary.com/entry/2021/02/16/003631
