82957 AWizzArd ;;; Nice would be something like ;;; (split-when (= % :x) [1 2 3 4 :x 5 6 7 8 :x 9 10 :x 11] ==> ;;; ((1 2 3 4) (:x) (5 6 7 8) (:x) (9 10) (:x) (11)) ;;; ;;; How to do this easier than: (use 'clojure.contrib.seq-utils) (let [group (atom 1), old (atom true)] (group-by #(if (= % :x) (do (reset! old false) (swap! group inc)) (if @old @group (do (reset! old true) (swap! group inc)))) [1 2 3 4 :x 5 6 7 8 :x 9 10 :x 11])) ;;; ? ;;; While this is not exactly the same result as above ;;; but the data format comes close. 3455623950 #clojure Common Lisp TRUE