[old] Chess Knight

[old] Chess Knight

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Your friend loves chess very much, but he's not a strong player. You can help him by using your programming skills.
If this mission is too simple for you, try another one from this set - The shortest Knight's path.

Your task is to write a function that can find all of the chessboard cells to which the Knight can move. The input data will consist...
If the same cell appears more than once - do not add it again. You should return the list of all of the possible cells and sort them as follows: in alphabetical order (from 'a' to 'h') and in ascending order (from 'a1' to 'a8' and so on).

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