https://en.wikipedia.org/wiki/Kogin-zashi
https://www.myvisiblemend.no/blogs/myvisiblemend/hva-er-kogin
https://koginbank.com/en/about/kogin-zashi-hishi-zashi/
https://youtu.be/i6lvlCiXwmA?si=vTOc1psx-DYPmOmn