A while back, I started tinkering with a new flavor of Lisp (for me): Scheme, using the ChezScheme dialect. A Scheme-compliant Lisp is one which (among some other bits) implements a faily minimal set of functions/macros; simple string manipulations, data structures and compound data types, basic math and I/O, and a fairly sophisticated function definition, error handling, and hygienic macro facility (a full summary of the language spec can be found here).
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