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There were ten apples four of which were rotten (문장) ( 1 )

There were ten apples. Four of the apples were rotten.
There were ten apples four of which were rotten.

=> 10개의 사과중에서 네개의 사과가 상했다

rdfs:label : There were ten apples four of which were rotten.

이 문장이 속한 전치사 + 관계대명사 of_which