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Logo Argio-logic.net
definitions and information are taken from Rohan Rao blog & Sudopedia

Rules:
Place numbers in the grid such that each row, column and 3x3 box contain the numbers 1 to 9. Each set of four small numbers in the intersection of two lines indicate the numbers that are in the four adjacent cells.
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Inserire i numeri in modo che ogni riga, colonna e settore contenga i numeri da 1 a 9. I quattro numeri indicati nei rettangoli alle intersezioni delle celle indicano i numeri presenti nell 4 celle adiacenti.


Solution