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We haven’t done one of these in quite a while. So to refresh your memory, this is a Sudoku puzzle with a twist—it uses letters instead of digits, and hidden within it is a name that any computer scientist should be familiar with.

Simply fill in the empty cells with the nine letters E, H, J, K, N, O, T, U, and Y, so that each row, column, and small square contains each of the nine letters once.

Solution next month.