(DEFPROP EOF T SPECIAL)
(DEFPROP FILE1 T SPECIAL)
(DEFPROP FILE2 T SPECIAL)
(DEFPROP SLASHIFY
(LAMBDA (L)
(PROG (&V &VV &L1 I)
(SETQ &L1 L)
(SETQ &V (SETQ &VV (LIST NIL)))
LOOP (COND ((NULL &L1) (RETURN (CDR &V))))
(SETQ I (CAR &L1))
(SETQ &L1 (CDR &L1))
(NCONC &VV (SETQ &VV (LIST (QUOTE //) I)))
(GO LOOP)))
EXPR)