*1:See also https://sumita-m.hatenadiary.com/entry/2020/02/23/115654 https://sumita-m.hatenadiary.com/entry/2020/04/10/120111 https://sumita-m.hatenadiary.com/entry/2020/04/11/093405 https://sumita-m.hatenadiary.com/entry/2020/05/28/033029 https://sumita-m.hatenadiary.com/entry/2020/06/01/100044 https://sumita-m.hatenadiary.com/entry/2020/06/01/10110 https://sumita-m.hatenadiary.com/entry/2020/07/02/134619 https://sumita-m.hatenadiary.com/entry/2020/07/09/152416 https://sumita-m.hatenadiary.com/entry/2020/07/12/225542 https://sumita-m.hatenadiary.com/entry/2020/07/16/085322