(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)