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Root also falls into two categories: free and bound.（北二外2006研)
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Auditory phonetics studies how sounds are perceived by the speaker.（清华2001研)
Free morpheme may constitute words by themselves.（大连外国语学院2008研)
The words "loose" and "books" have a common phoneme and a common morpheme as well.(北二外2007研)
The word of "impossibility" contains four morphemes.（对外经贸2006研)
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