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Richard Walker

Unique Word

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How is the word

CHECKBOOK

unique? Answer tomorrow.

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Richard Walker

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It has symmetry about a horizontal mirror line; if you invert it it remains the same. It is the longest word for which this is true. I wrote a Python program to run through a Scrabble word list looking for examples. Tomorrow I will publish the results in full.

Resilience

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So it does! Interesting.