Jan Burse, created Jun 30. 2019
* CLP(FD) code for the Zebra riddle.
* First published as "Who owns the Zebra?" in the Life International
* magazine on December 17, 1962 with solution given in the March 25,
* 1963 issue. The riddle given here is not a verbatim copy.
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Nationality = [Brit,Swede,Dane,Norwegian,German],
Pet = [Dog,Bird,Cat,Horse,_],
Cigarette = [Pallmall,Dunhill,Rothmans,Marlboro,Winfield],
Drink = [Tea,Coffee,Milk,Beer,Water],
Color = [Red,White,Green,Yellow,Blue],
Dunhill-Horse+1 #= Dist1,
Marlboro-Water+1 #= Dist3,
Norwegian-Blue+1 #= Dist4,
[Dist1,Dist2,Dist3,Dist4] ins 0\/2,