I am currently working on Structure Definitions and am hoping that I can get some feedback through this mailing list on whether I am doing things correctly or not. Exercise 6.4.3. Provide a structure definition and a data definition for representing three-letter <code class="scheme">word</code>s. A word consists of letters, which we represent with the symbols <code class="scheme">'a</code> through <code class="scheme">'z</code>. Here is what I have come up with. ;; word : symbol -> symbol ; produce a word with the letters it's made of. ; word is a structure ; (make-word first-letter second-letter third-letter) ; where first-letter, second-letter, and third-letter are symbols 'a thru z' (define-struct word (first-letter second-letter third-letter)) (define cat (make-word 'c 'a 't)) Using the interactive prompt I can do the following: > (word-first-letter cat) 'c > (word-third-letter cat) 't