2017悬疑美剧:Quiz:a word game .
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an example, the word 'head' may be changed into 'tail' by interposing the words 'heal, teal, tell, tall. Thus head changed into tail in five moves:
HEAD
HEAL
TEAL
TELL
TALL
TAIL
Change SICK into WELL in four moves
HEAD
HEAL
TEAL
TELL
TALL
TAIL
Change SICK into WELL in four moves
sick
silk
sill
sell
well
SICK
SILK
SILL
SELL
WELL