(def does-maths-work1 (if (not (= (+ 2 2) 4)) "UH OH" "Maths works!"))
(def does-maths-work2 (if-not (= (+ 2 2) 4) "UH OH" "Maths works!"))
(println does-maths-work1)
(println does-maths-work2)
(if (= (+ 2 2) 4) (do (println "Maths works!") (println "Hooray!")))
(when (= (+ 2 2) 4) (println "Maths works!") (println "Hooray!"))
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