| http://www.w3.org/ns/prov#value | - So, too, in a difficult Sudoku puzzle it is not uncommon for one, or even two numbers to be completely absent from the grid when the game begins ??? the missing number, or numbers, are an integral part of the ???plot??? of the puzzle, but, at least at the beginning, they can only be discerned by the reaction of other numbers that surround their invisible presence.
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