http://luc.lino-framework.org/blog/2019/1121.html
http://luc.lino-framework.org/blog/2019/1121.html

lino-framework/book,lino-framework/book,lsaffre/lino_book,lino-framework/book,lsaffre/lino_book,lino-framework/book,lsaffre/lino_book