Q: Sentence (1) The separation of wheat from chaff.
Sentence (2) He hid in the separation between walls.. Word: separation.
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A: different meanings

Q: Sentence (1) My sister lives in that apartment building.
Sentence (2) There was a three-story building on the corner.. Word: building.
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A: the same meaning

Q: Sentence (1) We used a poison to kill the weeds.
Sentence (2) The poison of fascism.. Word: poison.
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A:
different meanings