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Ponder This Challenge - December 2001 - Knight's tour on 4xN chess boards
PuzzleDon Coppersmith- Ponder This
Ponder This Challenge - November 2001 - PB&J asymmetry bounds
PuzzleDon Coppersmith- Ponder This
Ponder This Challenge - October 2001 - f maps any open interval onto R
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Ponder This Challenge - September 2001 - Bounds on a permutation group
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Ponder This Challenge - August 2001 - Points on a plane
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Ponder This Challenge - July 2001 - 1/1 + 2/(2+3) + 3/(4+5+6) + ...
PuzzleDon Coppersmith- Ponder This
Ponder This Challenge - June 2001 - Goblin chase in a train
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Ponder This Challenge - May 2001 - Goblin chase in a pool
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Ponder This Challenge - April 2001 - College saving account
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Ponder This Challenge - March 2001 - Golf - hit in one
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Ponder This Challenge - February 2001 - Kubricia's 2001 money boxes
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Ponder This Challenge - January 2001 - Counting segments overlays
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Ponder This Challenge - December 2000 - Commuter gets 20 minutes earlier
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Ponder This Challenge - November 2000 - 75 integers in [1,230]
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Ponder This Challenge - October 2000 - One+five(four) cards trick
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Ponder This Challenge - September 2000 - Simplify sqrt expression
PuzzleDon Coppersmith- Ponder This