[plt-scheme] solution for exercise 11.2.4

the template could be:

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

how many clauses does the data def have? (how many clauses must the  
function def have?)

I think 2 (the data can be a symbol or a list)




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