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(import 'javax.swing.JOptionPane)
(defn ask
"Ask the user a question. Returns nil if the user aborts."
[title question]
(JOptionPane/showInputDialog nil question title
(defn ask-the-user-seq []
(when-let [answer (ask "Your computer wonders"
"What is the next element of the sequence?")]
(cons answer (ask-the-user-seq)))))
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