Show HN: Implementation of John McCarthy's AMB operator in Portable Common Lisp

* The SICP chapter describing the use of the ambiguous operator: https://mitpress.mit.edu/sites/default/files/sicp/full-text/...

* AMB manual: https://github.com/phoe/amb/blob/main/doc/MANUAL.md

* Some test cases from SICP exercises implemented in AMB: https://github.com/phoe/amb/blob/main/t/test-sicp.lisp

Nice, thanks :)