;; The first three lines of this file were inserted by DrScheme. They record metadata
;; about the language level of this file in a form that our tools can easily process.
#reader(lib "htdp-beginner-reader.ss" "lang")((modname 11.2.4) (read-case-sensitive #t) (teachpacks ((lib "draw.ss" "teachpack" "htdp") (lib "arrow.ss" "teachpack" "htdp"))) (htdp-settings #(#t constructor repeating-decimal #f #t none #f ((lib "draw.ss" "teachpack" "htdp") (lib "arrow.ss" "teachpack" "htdp")))))
A deep-list is either
1. a symbol or
2. (cons dl empty) where dl is a deep-list.

depth : deep-list -> number
Consumes a deep-list dl and determines how many
cons were used to construct it.

(define (depth dl)
  (cond
    []
    []))