*1:See also https://sumita-m.hatenadiary.com/entry/20161015/1476517356 https://sumita-m.hatenadiary.com/entry/2020/05/24/031945 https://sumita-m.hatenadiary.com/entry/2020/07/20/233418 https://sumita-m.hatenadiary.com/entry/2020/07/31/02061 https://sumita-m.hatenadiary.com/entry/2020/08/06/005528 https://sumita-m.hatenadiary.com/entry/2020/08/09/004427 https://sumita-m.hatenadiary.com/entry/2020/08/12/225308 https://sumita-m.hatenadiary.com/entry/2020/09/04/144825 https://sumita-m.hatenadiary.com/entry/2020/10/09/143912 https://sumita-m.hatenadiary.com/entry/2020/10/17/141519 https://sumita-m.hatenadiary.com/entry/2020/12/29/171959 https://sumita-m.hatenadiary.com/entry/2021/01/31/103236 https://sumita-m.hatenadiary.com/entry/2021/02/18/161721