*1:See also https://sumita-m.hatenadiary.com/entry/2020/07/25/014019 https://sumita-m.hatenadiary.com/entry/2020/08/11/095935
*2:See also https://sumita-m.hatenadiary.com/entry/2020/03/01/093003 https://sumita-m.hatenadiary.com/entry/2020/03/15/094840 https://sumita-m.hatenadiary.com/entry/2020/03/23/092958 https://sumita-m.hatenadiary.com/entry/2020/03/23/130845 https://sumita-m.hatenadiary.com/entry/2020/04/05/135314 https://sumita-m.hatenadiary.com/entry/2020/04/15/133650 https://sumita-m.hatenadiary.com/entry/2020/05/01/143143 https://sumita-m.hatenadiary.com/entry/2020/06/01/095331 https://sumita-m.hatenadiary.com/entry/2020/06/15/082459 https://sumita-m.hatenadiary.com/entry/2020/06/16/085701 https://sumita-m.hatenadiary.com/entry/2020/06/26/004544 https://sumita-m.hatenadiary.com/entry/2020/07/02/134619 https://sumita-m.hatenadiary.com/entry/2020/07/08/095401 https://sumita-m.hatenadiary.com/entry/2020/07/16/085322 https://sumita-m.hatenadiary.com/entry/2020/07/17/022629 https://sumita-m.hatenadiary.com/entry/2020/07/26/083441 https://sumita-m.hatenadiary.com/entry/2020/08/28/013708 https://sumita-m.hatenadiary.com/entry/2020/09/29/022822