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Task/ABC-Problem/Clojure/abc-problem.clj

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+(def blocks
+  (-> "BO XK DQ CP NA GT RE TG QD FS JW HU VI AN OB ER FS LY PC ZM" (.split " ") vec))
+
+(defn omit
+  "return bs with (one instance of) b omitted"
+  [bs b]
+  (let [[before after] (split-with #(not= b %) bs)]
+    (concat before (rest after))))
+
+(defn abc
+  "return lazy sequence of solutions (i.e. block lists)"
+  [blocks [c & cs]]
+  (if-some c
+    (for [b blocks :when (some #(= c %) b)
+          bs (abc (omit blocks b) cs)]
+      (cons b bs))
+    [[]]))
+
+
+(doseq [word ["A" "BARK" "Book" "treat" "COMMON" "SQUAD" "CONFUSE"]]
+  (->> word .toUpperCase (abc blocks) first (printf "%s: %b\n" word)))