See CommonLispPrevalence.
It was written by Sven Van Caekenberghe, and is currently maintained by Leslie Polzer?. The latest stable version, plus bugfixes, can be found at Bitbucket .
Download ASDF package from http://www.common-lisp.net/project/cl-prevalence/cl-prevalence.tgz
This page is linked from: CommonLispPrevalence
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