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Advent calendar 2021

16 December

Each clue in this crossnumber is formed of two parts connected by a logical connective: and means that both parts are true; nand means that at most one part is true; or means that at least one part is true; nor means that neither part is true; xor means that exactly one part is true; xnor means that either both parts are false or both parts are true. No number starts with 0.

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