Aunc.1595 net.applic utzoo!decvax!duke!unc!bts Wed Dec 16 21:12:11 1981 functional languages In addition to LISP, KRC, and FP or FFP languages, there's PROLOG. It's sort of a functional language, based on Kowalski's procedural interpretation of Horn clause logic. Locally, PROLOG is being used at Duke in constructing expert knowledge systems.