When the puzzle is solved, there will be a cycle that passes through all 36 cells via adjacent cells that are labeled A-B-C-...-X-Y-Z-0-1-2-...-7-8-9-A. That is, each pair of consecutive letters must be in adjacent cells, Z must be adjacent to 0, each pair of consecutive digits must be in adjacent cells, and 9 must be adjacent to A. Adjacency includes horizontal, vertical, or diagonal. Use logical reasoning. No guessing necessary.
Grid: Enter single characters into cells, like a crossword
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