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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Role Action
Block Prevents the target player from acting
Redirect Change target player target.
Save Protects the target player from death.
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Brian
Chris
Daniel
Fred

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Who is the murderer then?

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Challenging

There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.