Coin touches coins

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?




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In an office's desk, you find a unique method that shows the current day of the month. Two numbered cubes are used to depict the current date.

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2. The oldest person and the witness were not of the same sex.

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In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki