Decide

The rectangle is divided into seven fields. On each box is to write just one of the numbers 1, 2 and 3.

Mirek argue that it can be done so that the sum of the two numbers written next to each other was always different. Zuzana (Susan) instead argue that it is not possible. Decide which of them is right.

Your answer:





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You need to know the following knowledge to solve this word math problem: