中国股票交易时间表: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

sick

silk

sill

sell

well

SICK

SILK

SILL

SELL

WELL