The [[wp:Zebra puzzle|Zebra puzzle]], a.k.a. Einstein's Riddle,
is a logic puzzle which is to be solved programmatically.
It has several variants, one of them this:
:# There are five houses.
:# The English man lives in the red house.
:# The Swede has a dog.
:# The Dane drinks tea.
:# The green house is immediately to the left of the white house.
:# They drink coffee in the green house.
:# The man who smokes Pall Mall has a bird.
:# In the yellow house they smoke Dunhill.
:# In the middle house they drink milk.
:# The Norwegian lives in the first house.
:# The Blend-smoker lives in the house next to the house with a cat.
:# In a house next to the house with a horse, they smoke Dunhill.
:# The man who smokes Blue Master drinks beer.
:# The German smokes Prince.
:# The Norwegian lives next to the blue house.
:# They drink water in a house next to the house where they smoke Blend.
The question is, who owns the zebra? For clarity, each of the five houses is painted a different color, and their inhabitants are of different nationalities, own different pets, drink different beverages and smoke different brands of cigarettes.
Additionally, list the solution for all the houses.
Optionally, show the solution is unique.
;Related tasks:
* [[Dinesman's multiple-dwelling problem]]
* [[Twelve statements]]