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