[ehudla]

The original version in Common Lisp is also available: http://web.cecs.pdx.edu/~mm/how-to-get-copycat.html

[jalanb]

I implemented it in Python (while reading from that LISP version, a Java version, and Melanie Mitchell's "Analogy-Making as Perception"): https://github.com/jalanb/co.py.cat