Side question: is it known how close these ports are to the original? As far as I can find, the rule mechanism the original ELIZA used is well documented, and s

Side question: is it known how close these ports are to the original? As far as I can find, the rule mechanism the original ELIZA used is well documented, and some example transcripts are published. But nowhere can I find documentation of the specific rules implemented by the original ELIZA in that rule mechanism, to produce those example transcripts. Where did the rules in the many latter-day ports come from? Are some of them based directly on the original code lineage, before it disappeared? Or is it actually still available somewhere, and I just can't find it? Or did they invent their own rules in the spirit of the original, aiming to reproduce its behavior but not via a direct port?