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definitions and information are taken from Rohan Rao blog & Sudopedia

Rules:
Place numbers in the grid such that every row, column and 3x3 box contain the numbers 1 to 9. The cells having repeated neighbors (cells sharing an edge with the same number) are marked (yellow). Cells which are not marked cannot contain repeated neighbors.

Inserire i numeri in modo che ogni riga, colonna, settore contenga i numeri da 1 a 9. le celle che hanno due vicini (in orizzontale o verticale) contenenti lo stesso numero sono colorate in giallo. Le celle bianche non possono avere vicini uguali .


Solution