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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Please forgive me Jahanpanah. I arrived late because my child was crying and I had to calm him down, explained Birbal.
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Father, I want a cow, said Birbal.
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I want to drink its milk, now, now, now! said Birbal, imitating the voice of his child.
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Jack: Cool..But I still don't know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh, now I get it.

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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