Non-Deterministic Evaluation In Under 300 Bytes

[Aahz Maruch]

In article <m3og89qg94.fsf at atrus.jesus.cam.ac.uk>,
Michael Hudson  <mwh21 at cam.ac.uk> wrote:
>
>I was playing around with Chris Tismer's stackless python today, and
>wondering what I could actually use continuations for, so I pulled my
>copy of On Lisp off the bookshelf and came up with:

For those of us who don't have _On Lisp_, could you explain what the
code does?
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