[plt-scheme] solution for exercise 11.2.4

If I recall the data definition you just posted correctly, this  
doesn't match it.  Which elements of the data definition are self- 
referential?  What does this imply about the template?

(define (depth a-dl)
>  (cond
>    [(symbol? a-dl) ...]
>    [else ... (list? a-dl) ... (depth (rest a-dl)) ...]))


is it right????
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