[racket] multi-line strings in ISL?

Is there a good way to create multi-line strings in ISL?  For example,
instead of producing output in the form

(list
 "(* 11
      "
 "   22
      "
 "   33
      "
 "   44
      "
 "   55)
       ")

[where here I've padded the strings out to 80 characters to force the
Racket printer to produce each string on a separate line.]

I'd like to have a program that produced the output

(* 11
   22
   33
   44
   55)

preferably without quotations.  When I put things like #\n #\newline or #\r
in the middle of a string, ISL prints them out like #\n, #\newline, or #\r.

Any ideas?  What have I overlooked?

--Mitch
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