Logic Masters Deutschland e.V.

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CTC:

This is a very easy and hopefully enjoyable one

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Place digit 1-6 once in each row and column.

Along a zipper line, digits equidistant from the line center sum up to a prime number. These primes are different for different zip lines.

If a line consists of an odd number of cells, the prime, which the equidistant digits sum to, is in the center cell of the line.