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Puzzle: WHITE->BLACK

Had this puzzle to keep me entertained awhile back: changing one letter at a time, with every new word being a valid word (e.g. "pail" to "bail"), what's the minimum number of steps to change "WHITE" to "BLACK"? The answer I came up with is below (eight steps).

WHITE
WHILE
WHALE
SHALE
SHARE
SHARK
SHACK
SLACK
BLACK

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