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A puzzle whose solution is a methodological plan of action for realizing a specific goal.

9 votes
1 answer
301 views

Communicate square on a 3-by-3 grid by flipping precisely one of 13 coins

You may then agree a strategy beforehand. The only things you do not know in advance are which coins are showing heads and which are showing tails, and the square which needs to be communicated. …
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