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5-4-3-2-1: blast off! Math = love: the 5-4-3-2-1 challenge from will shortz and npr Challenge will math npr shortz naming puzzle

5-4-3-2-1: Blast OFF!

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5-4-3-2-1: Blast OFF!

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Math = Love: The 5-4-3-2-1 Challenge from Will Shortz and NPR