I've never heard of constraint programming languages before, and I kind of wish I had, because I recently had a problem where I needed to sequence a bunch of el

I've never heard of constraint programming languages before, and I kind of wish I had, because I recently had a problem where I needed to sequence a bunch of elements based on a lot of arbitrary rules. Sequencing based on one rule was easy, but applying all simultaneously was a huge PITA, and resulted in much headaches; this tool looks like it could have solved the problem quickly. Definitely putting this in my bookmark tool-set for future use.