Normal sudoku rules apply. Cells that are a knight's move away are not allowed to contain identical digits. Both digits (which can be equal) on the endpoints of a line form a look-and-say clue. For example, if the digits on the endpoints are 5 and 3, then there have to be exactly five 3s AND three 5s on this line. The different line colors are only used to avoid confusion regarding line crossings.
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