I keep running into the situation where I would call functions of the
form (fn [ & rest] ...) with data that I have built up in a sequence,
and can't figure out how to do it.  My current instance of this is
wanting to call clojure.contrib.combinatorics/cartesian-product on a
list of lists of items.  For example, I want:

(def k '((a b) (1 2))
(cartesian-product k)

to produce the same result as

(cartesian-product '(a b) '(1 2))

This seems like an operation that should be common, but I just can't
find it.  I did try a quick macro like:

(defmacro unapply [f as] `(~f ~...@as))

But then I can't figure out how to get ~@ to apply to the value of
"as" or how to quote the individual elements of the spliced unquote.

Any help would be appreciated.

Thanks,
Paul Henning
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