The interleave function has a unary implementation on my machine using Clojure 1.8.0, which makes the following a valid solution to problem 33:
#(apply interleave (take %2 (repeat %1)))
But the above code fails on the third unit test on website:
(= (__ [4 5 6] 1) '(4 5 6))
raising the following exception:

clojure.lang.ArityException: Wrong number of args (1) passed to: core$interleave