jwi·11 か月前·議論They recently recovered the 'Pebble' trademark and thus rebranded: https://ericmigi.com/blog/july-pebble-update
jwi·9 年前·議論FYI, there's an updated version of the 99 Prolog problems by its original author here: https://sites.google.com/site/prologsite/prolog-problems