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Q: What exceptional words turn into other words by both insertion and
deletion of letters?

A:
   longest word both charitable and hospitable
    AMY: AM,AY,MY;GAMY,ARMY,AMOY,AMYL
   shortest word both stingy and hostile  TUX (3)
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Unless noted otherwise, all words occur in Webster's Third New International
Dictionary, Merriam-Webster, Springfield, MA, 1961.
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