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Card Tableau in Black and White (Posted on 2010-11-30) Difficulty: 3 of 5
There are 16 cards: 8 black and 8 white. On each card is a number between 1 and 4 inclusive. There are:

4 white cards with a 1     6 black cards with a 1
2 white cards with a 2     2 black cards with a 2
1 white card with a 3 
1 white card with a 4 

Arrange the cards into a 4x4 grid such that the number on each card represents the number of black cards among its 2, 3 or 4 orthogonally adjacent cards, and so that the top-rightmost card is a black card with a 1 on it.

See The Solution Submitted by Charlie    
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  Subject Author Date
Solutioncomplete solutionPaul2010-11-30 22:50:57
re: Possible SolutionJyqm2010-11-30 15:24:54
Possible Solutionbroll2010-11-30 12:56:24
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