## 150 Puzzles in Crypt-arithmetic |

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aaaa ABCD arithmetic Bibliography Capablanca chess classic column combinations crypt-arithmetic cryptarithm cube diagrams divisible by 11 Dover E. F. Bleiler edition elimination end game end in zero English equal 9 equals a number factors famous Formerly titled fourth figure Fred Reinfeld Game of Logic H. L. Mencken hence humor illustrations impossible Index insects Introduction Lasker last digit letters Lewis Carroll magic squares Martin Gardner master MATHEMATICAL PUZZLES Mazes modern multiple of 11 multiplicand nonsense verses number divisible number ending original Osier Paperbound photographs Pillow Problems play player prime numbers psychology quotient Recreational Mathematics second partial product solution Sphinx Symbolic Logic T. L. Heath Tangled Tale terminates TH I S theory third partial product three digits tricks two-digit number X X X X X X xxAx xxxx xxxx xxxx xxxxx xxxx xxxxxxx xxxxxx2 xxxxxxx