map (\x -> exists' (singleton x) (<= 4)) (filter (set [1..3]) [0..10])

(ns duck-hunt
  (:use :reload-all [clodiuno core firmata])
  (:import (java.awt Toolkit Color)
           (java.awt.image BufferedImage)
           (java.awt.event KeyAdapter)
           (javax.swing JFrame JPanel)))

(defn screen-size []
  (let [screen (.getScreenSize (. java.awt.Toolkit getDefaultToolkit))]
    [(.getWidth screen) (.getHeight screen)]))