http://luc.lino-framework.org/blog/2019/0905.html
http://luc.lino-framework.org/blog/2019/0905.html

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