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docs: 

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code: 

General comment: 
 the word repl should disappear

guess.ss: repl, repl3,
  check that the result is a symbol gives bad error message 

master.ss 
  add close? button 

hangman.ss
  error messages: can we do better? 
  (test-error (hangman-list (lambda (x y z) x) first))
  (test-error (hangman-list (lambda (x y z) x) list))
  
  the game should be "start-once only"

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