Returns a lazy seq of the intermediate values of the reduction (as per reduce) of coll by f, starting with init.
; clojure/contrib/seq_utils.clj:113 (defn reductions ([f coll] (if (seq coll) (rec-seq self (cons (first coll) (map f self (rest coll)))) (cons (f) nil))) ([f init coll] (rec-seq self (cons init (map f self coll)))))
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