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 a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
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The third house is 10 meters nearer to the fourth house than it is to the second house.

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In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
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ABEABB
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I am sometimes honest
Sometimes dishonest
I can be sweet and also bitter
I can hurt you real bad and
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Crossword puzzles

In the 1920s, people feared that crossword puzzles would contribute to illiteracy.