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Starting with HEAD, change one letter at a time until you have the word TAIL.
Each change leaves the other letters in their original places and must result in a proper word.
What is the minimum number of steps required to achieve this change?
HEAD
....
....
....
TAIL
[Ref: ZYCP] © Kevin Stone
5 steps.
HEAD HEAR HEIR HAIR HAIL TAIL
or
HEAD HEAL HELL HALL TALL TAIL.
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