(expand$ $?a)
(deffunction boggle ($?a) (return $?a))
(boggle 1 2 3)
(progn $?a)
(while $?a do)
(if $?a then 1)
(eval "$?*x*")
(defrule foo
  ?f<-(foo $?b)
=>
  (retract ?f)
  (printout t ?b crlf)
  (printout t $?b crlf))
(assert (foo a b c))
(run)
(undeffunction boggle)
(undefrule foo)
(+ $?*x*)
(deffunction bar ($?a) (foo $?a))
(bar 1 2)
(bar 1 2 3)
(> (expand$ (create$ 3)))
(> (expand$ (create$ 4 3)))
(> (expand$ (create$ 4)) (expand$ (create$ 3)))
(> (expand$ (create$ 3)) (expand$ (create$)))