Okay, now after actually reading the documentation I can come back with
an actually correct response!

You should only have to change one function:

>     (defn make-node [n children]
>       (vec (cons (first n) children)))

Your issue was that your original `make-node` function didn't return a
vector, it returned a ConsCell (with a vector as its tail). This meant
that your new node no longer returned true for "children", that is it
identified itself as a leaf.

By making `make-node` return a vector (vec turns any sequable thing into
a vector) your `make-node` now returns a valid branch node, so z/next
behaves as you want it to.

Carlo

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