gistfile1.clj

(ns dinesman
  (:refer-clojure :exclude [==])
  (:use clojure.core.logic))

(defne aboveo [x y l]
  ([_ _ [y . r]]
     (membero x l))
  ([_ _ [z . r]]
     (!= z y)
     (aboveo x y r)))

(defne not-above1o [x y l]
  ([_ _ ()])
  ([_ _ [a . ()]])
  ([_ _ [a x . r]] (!= a y))
  ([_ _ [_ a . r]]
     (!= a x)
     (fresh [nl]
       (conso a r nl)
       (not-above1o x y nl))))

(defn not-adjacento [x y l]
  (all
   (not-above1o x y l)
   (not-above1o y x l)))

(run* [q]
  (fresh [a b c d e]
    (== q [a b c d e])
    (permuteo [:Baker :Cooper :Fletcher :Miller :Smith] q)
    (!= e :Baker) (!= a :Cooper)
    (!= e :Fletcher) (!= a :Fletcher)
    (aboveo :Miller :Cooper q)
    (not-adjacento :Smith :Fletcher q)
    (not-adjacento :Fletcher :Cooper q)))