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I believe this is the code for their work, which I believe the authors didn't put in the paper: https://github.com/philzook58/egglog

That is a previous defunct prototype wildly superseded by the current implementation. I still have a soft spot for the syntax though

Close, but the link is on Page 13, and it points here: https://github.com/mwillsey/egg-smol

Unfortunately the naming is all a bit confusing, isn't it....