00349nam a2200121Ia 4500008004100000041001200041082002100053100002000074245004400094260004100138300000800179650004000187231217s9999    xx            000 0 und d  aEnglish  a793.73  CHA;1  R  aChaturvedi, B K 0aMathematical puzzles and brain twisters  c2004bDiamond Pocket Bks.aNew Delhi  a158  aMathematical,puzzles,brain,twisters