1 12687dd9 2023-08-04 jrmu ;; The first three lines of this file were inserted by DrScheme. They record metadata
 2 12687dd9 2023-08-04 jrmu ;; about the language level of this file in a form that our tools can easily process.
 3 12687dd9 2023-08-04 jrmu #reader(lib "htdp-intermediate-reader.ss" "lang")((modname 16.2.1) (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")))))
 4 12687dd9 2023-08-04 jrmu A file is a symbol.
 5 12687dd9 2023-08-04 jrmu 
 6 12687dd9 2023-08-04 jrmu A directory is either
 7 12687dd9 2023-08-04 jrmu 1. empty,
 8 12687dd9 2023-08-04 jrmu 2. (cons f dir) where f is a file
 9 12687dd9 2023-08-04 jrmu and dir is a directory, or
10 12687dd9 2023-08-04 jrmu 3. (cons dir1 dir2) where dir1, dir2
11 12687dd9 2023-08-04 jrmu are directories.
12 12687dd9 2023-08-04 jrmu