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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | ; Another Micro KANREN Example Program
; By Nils M Holm, 2006,2007
; See the file LICENSE of the ArrowLISP distribution
; for conditions of use.
; Solve the Zebra puzzle:
; zl -n 1024K
; (load zebra)
; (zebra)
(require 'amk)
(define (lefto x y l)
(let ((vt (var 't)))
(any (all (caro l x)
(cdro l vt)
(caro vt y))
(all (cdro l vt)
(lambda (s)
((lefto x y vt) s))))))
(define (nexto x y l)
(any (lefto x y l)
(lefto y x l)))
(define (zebra)
(let ((h (var 'h)))
(run*
h
(all (== h (list (list 'norwegian (_) (_) (_) (_))
(_)
(list (_) (_) 'milk (_) (_))
(_)
(_)))
(memo (list 'englishman (_) (_) (_) 'red) h)
(lefto (list (_) (_) (_) (_) 'green)
(list (_) (_) (_) (_) 'ivory) h)
(nexto (list 'norwegian (_) (_) (_) (_))
(list (_) (_) (_) (_) 'blue) h)
(memo (list (_) 'kools (_) (_) 'yellow) h)
(memo (list 'spaniard (_) (_) 'dog (_)) h)
(memo (list (_) (_) 'coffee (_) 'green) h)
(memo (list 'ukrainian (_) 'tea (_) (_)) h)
(memo (list (_) 'luckystrikes 'orangejuice (_) (_)) h)
(memo (list 'japanese 'parliaments (_) (_) (_)) h)
(memo (list (_) 'oldgolds (_) 'snails (_)) h)
(nexto (list (_) (_) (_) 'horse (_))
(list (_) 'kools (_) (_) (_)) h)
(nexto (list (_) (_) (_) 'fox (_))
(list (_) 'chesterfields (_) (_) (_)) h)
; (memo (list (_) (_) 'water (_) (_)) h)
(memo (list (_) (_) (_) 'zebra (_)) h)))))
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