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Again, let's look closer at the hypothetical table that was built in the previous step.  This table closely resembles one that was already discussed in the previous step, and was found to be contradictory.  In fact, this table has the same basic fault:

 No  1 2 3 4 5
Col yellow blue red green white
Nat Norw Dane Brit Swede Germ
Bev   tea milk coffee  
Cig Dunh       Prince
Pet   horse      

Indeed, one of the owners of the house 2, 3 or 4 should smoke Blue Master, since we know already that none of the owners of house 1 or 5 smokes it.  And as far as:
12. The owner who smokes  Blue Master  drinks  beer.
one of the owners of the house 2, 3 or 4 should drink beer.

However, our hypothetical table shows that none of them can drink beer.  So the second of three possible distributions leads to a contradiction, and should therefor be discarded (along with the first one).

This makes the third distribution:

 No  1 2 3 4 5
  1 Norw Germ Brit Swede Dane
  2 Norw Dane Brit Swede Germ
  3 Norw Dane Brit Germ Swede

the only remaining possibility, and we have no other choice, but to try to follow it.

 No  1 2 3 4 5
Col yellow blue red green white
Nat Norw Dane Brit Germ Swede
Bev     milk coffee  
Cig Dunh        
Pet   horse      

From this point on solution rolls down the hill and choices become easy.  Can you figure out what those choices are?


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