*1:See also https://sumita-m.hatenadiary.com/entry/2020/05/19/153515
*2:See also https://sumita-m.hatenadiary.com/entry/20130413/1365875653 https://sumita-m.hatenadiary.com/entry/2019/10/28/100855 https://sumita-m.hatenadiary.com/entry/2019/12/24/023148 https://sumita-m.hatenadiary.com/entry/2020/01/14/095940 https://sumita-m.hatenadiary.com/entry/2020/02/06/024603 https://sumita-m.hatenadiary.com/entry/2020/02/15/083534 https://sumita-m.hatenadiary.com/entry/2020/02/23/140647 https://sumita-m.hatenadiary.com/entry/2020/03/05/033241 https://sumita-m.hatenadiary.com/entry/2020/03/17/142308 https://sumita-m.hatenadiary.com/entry/2020/03/21/025302 https://sumita-m.hatenadiary.com/entry/2020/03/31/153428 https://sumita-m.hatenadiary.com/entry/2020/04/09/010405 https://sumita-m.hatenadiary.com/entry/2020/04/28/022530 https://sumita-m.hatenadiary.com/entry/2020/04/29/112822 https://sumita-m.hatenadiary.com/entry/2020/05/01/100555 https://sumita-m.hatenadiary.com/entry/2020/05/13/101203 https://sumita-m.hatenadiary.com/entry/2020/05/20/004659
