Honestly the FSTs themselves were actually really cool, it's very much GOFAI. It automatically creates lots of permutations, i.e. `play taylor swift`, `please p

Honestly the FSTs themselves were actually really cool, it's very much GOFAI. It automatically creates lots of permutations, i.e. `play taylor swift`, `please play taylor swift`, play taylor swift now`. etc. And once the FST is built it always works deterministically. It's compiled to a graph and an incoming command is pushed through the state machine, if you get to an end state it "matched the fst" and some specific behaviour would be triggered. the rule were really just strings and we had efficient matching against it. I didn't work on that, I would assume some sort of LHS.