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Is there an answer list anywhere? It seems to me that some of these questions could have multiple answers depending on how you interprt the question. I know it is more about the thought exercise, but on some it would be nice to have the correct answer in order to learn how to find the solution.

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I only worked through the first 13, but none of them seemed to me to have multiple solutions (with the exception of whether you can have less than one kopeck, which the author would assume the readers knew you couldn't).

#18 does not have any answer. It's impossible to cover the squares as requested.

What do you mean? You just provided the answer. It's unique.

> I only worked through the first 13

> (with the exception of whether you can have less than one kopeck, which the author would assume the readers knew you couldn't)

You did notice that the cork in the second problem costs half a kopeck?

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