*1:See also https://sumita-m.hatenadiary.com/entry/2020/01/10/160055 https://sumita-m.hatenadiary.com/entry/2020/02/15/083534 https://sumita-m.hatenadiary.com/entry/2020/03/18/081633 https://sumita-m.hatenadiary.com/entry/2020/03/31/160332 https://sumita-m.hatenadiary.com/entry/2020/05/05/132203 https://sumita-m.hatenadiary.com/entry/2020/07/01/130653 https://sumita-m.hatenadiary.com/entry/2020/07/11/013854 https://sumita-m.hatenadiary.com/entry/2020/07/17/212507