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This is saved into a file, named as a command line argument. The file is parsed into a dictionary. In order to make backtracking easier, the entire board is stored in a single dictionary. The dictionary holds several different sets of data, kept separate by their keys. Cells have a tuple key of (x,y). Rows have a negative integer for their key, columns are positive integers. Both are 1-indexed to avoid a collision between +0 and -0.

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