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(defn compute-collatz [num steps]
(= num 1) steps
(even? num) (compute-collatz (/ num 2) (inc steps))
(odd? num) (compute-collatz (+ 1 (* num 3)) (inc steps))))
(defn collatz [num]
(pos? num) (compute-collatz num 0)
(throw (AssertionError. "Positive integer required."))))
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