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Crossed ladders problemSum and product puzzleRiver crossing puzzleTwo envelopes problemAges of three children puzzleKnights and knavesMissionaries and cannibals problemBlock-stacking problemCandle problemThree utilities problemTrolley problemBalanceCombination puzzleFutoshikiBirthday problemAlphameticInduction puzzlesBalance puzzleMasyuEuclidean shortest pathTemperature paradoxTower of london testMonty hall problemSnake-in-the-boxSliding puzzleLongest path problemBoy or girl paradoxCrosswordConnect the dotsChess problemMonkey and banana problemGoldbach's weak conjectureNo-three-in-line problemSlitherlinkProblem of pointsWord searchTower of hanoiTeletransportation paradoxShortest path problemMotion planningTemporal paradoxNurikabeChinese postman problemTiling puzzleLongest common subsequence problemKakuroTwo-body problemTetrominoMathematical chess problemDissection puzzleBongard problemBin packing problemNewcomb's paradoxWheat and chessboard problemClosest pair of points problemAllais paradoxEntscheidungsproblemProblem of apolloniusAnt on a rubber ropeCross-ratioStag huntTangramEuler's three-body problemJumbleCollision detection15 puzzleChicagoClock angle problemPicrossSet cover problemEthical dilemmaAlhazen's problemCollatz conjectureAnagram dictionaryPrinter's devilryNonogramMatrix chain multiplicationBeer distribution gameMixed graphGauss circle problemJosephus problemGettier problemPlanarity testing3sumCrossing numberBridgePsychology of reasoningGraph isomorphism problemClique problemTetrahedronFair divisionActivity selection problemKlein four-groupSatisfiability modulo theoriesDilemmaRsa problemLongest common substring problemMultiple-choice questionBasel problemComplexity class