Awesome... I found this on December 17th: https://www.research.ibm.com/haifa/ponderthis/challenges/January2001.html https://www.research.ibm.com/haifa/ponderth

Awesome... I found this on December 17th: https://www.research.ibm.com/haifa/ponderthis/challenges/January2001.html https://www.research.ibm.com/haifa/ponderthis/challenges/Jan... I can't remember if I stumbled upon that from HN or not, but it's a neat little problem to think about, and seems like it would have been nice to see Allen's algebra at the time.