It’s Elementary
(for all the math mavinim – and others, too)
Go from ONE to TWO in nine easy steps.
Start with O-N-E, finish with T-W-O and insert eight three-letter words between them.
Each three letter word must be valid (in the Scrabble dictionary).
Each three-letter word can only have one letter different from the preceding word.
ONE
_ _ _
_ _ _
_ _ _
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_ _ _
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TWO