A Lisp dialect descended from MLISP and MLISP2. Also

known as PLISP and VEL. Useful for parsing. Only the

pattern-matching system was published and fully implemented.

According to Alan Kay, LISP70 had an influence on

Smalltalk-72. "The LISP70 Pattern Matching System, Larry

Tesler et al, IJCAI 73.