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ChessboardCrossed ladders problemKirkman's schoolgirl problemGrid-inGomory's theoremGridSudokuWord problemHeesch's problemCrossnumberHoneycomb conjectureX-wingAlhazen's problemFutoshikiNonogramMathematical gameSandwich sudokuQuowerThistlethwaite's algorithmTable-maker's dilemmaCartesian gridSquare matrixWaring's problemQuasilatticeGod's algorithmChessboard distanceGeomagic squarePancake sortingTravelling salesman problemMagic squareWang tileGod's numberQuincunxSquareOptimization problemBoard ruleQuadrature of the circleExponentiationTraveling salesman problemMultimagic squareTravelling-salesman problemGriddingHidokuGridsquareProuhet-tarry-escott problemConstant problemTraveling-salesman problemBroken diagonalBimagic squareCannonball problemBongard problemPandiagonal magic squareSierpinski carpetOpen problemAlphameticPancake theoremBasel problemPrime reciprocal magic squareRook polynomialSupersquareQuadratureSquare-1KenkenLatin squareAlgebraic notationKiller sudokuJosephus problemTrimagic squareMasyuTower of hanoiMost-perfect magic squarePancake numberRegular gridCurse of dimensionalitySlitherlinkPolybius squareMagic cubeSquare numberGordan's problemIllumination problemAlphamagic squareDe bruijn's theoremEntscheidungsproblemPositionEigenproblemGame of lifeConference matrixBrocard's problemKociemba's algorithmZarankiewicz problemSchröder numberCanadian traveller problemMulticoverMatrixMatiyasevich's theoremTheory of gamesDelannoy numberPyraminxRule 184Cross