list merge help

[e]

this seemed like a clean, nice way to merge to sorted lists into one
sorted list.  I'm not getting clojure syntax, it seems:


(defn listmerge [l1 l2]
  (let [l1first (first l1) l2first (first l2)]
    (if (= l1first nil) l2)
    (if (= l2first nil) l1)
    (if (< l1first l2first)
      (cons l1first (listmerge (rest l1) l2))
      (cons l2first (listmerge (rest l2) l1)))
    ))

psuedocode:

listmerge (list l1, list l2):
   if l1 is empty, return l2
   if l2 is empty return l1
   if l1[0] is less than l2[0],
        return l1[0] + listmerge(rest(l1), l2)
   otherwise return l2[0] + listmerge(rest(l2), l1)

..... I see one thing.  I could move that second cons statement out of
the 3rd if and put it as the return for the let.
I doubt it will help.

Thanks.
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