Fill every white cell with a digit from 1 to 5.
Each horizontal and vertical run of five white cells must contain the digits 1 to 5 exactly once. Grey cells and the outer boundary separate the runs.
Each five-cell region outlined by thick lines must also contain the digits 1 to 5 exactly once.
Grey cells are not used. The small letters A to E mark the cells used for the solution code; fill these cells with digits as usual.
Solution code: Enter the digits in the cells marked A, B, C, D and E, in that order, without spaces (5 digits).
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