[plt-scheme] solution for exercise 11.2.4

From: carlo ambrogio (cr-service at hotmail.it)
Date: Mon Jun 9 17:00:13 EDT 2008

yes it's the 11.2.4 exercise of "how to design programs" book


I've got problems with a list of list.

the solution could be something like this


(define (depth adl)
  (cond
    [(symbol? adl) 0)]
    [(list? (first adl))...


and then???? 
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