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Hitori is a logic puzzle which consists of a grid of squares, each of which contains a number. The aim of the puzzle is to deduce which squares are to be blacked out and which are to be left white. The rules of the puzzle are as follows:

  1. There can only be one occurence (or none) of a given number in any row or column
  2. No two blacked out squares can be horizontally or vertically adjacent to each other
  3. All white squares must form one connected block when the puzzle is completed

Like Sudoku, Hitori is not a mathematical puzzle, because the numbers can be replaced by arbitrary symbols.


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