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Coded doubleblock (760)
Instruction:
Blacken some of the empty cells and enter the numbers from 1 to 5 in the remaining cells so that in each row and each column exactly two cells are blacked out and each number occurs exactly once. The numbers on the edge indicate the sum of the numbers that are between the two black cells.
However, some of the numbers have been replaced by letters. Same numbers by the same letters and different numbers by different letters.