Q: Sentence (1) The trunk was full of stuff.
Sentence (2) Wheat is the stuff they use to make bread.. Word: stuff.
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A: different meanings

Q: Sentence (1) It takes time to learn the setup around here.
Sentence (2) The laboratory included an elaborate setup for measuring the energy.. Word: setup.
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A: different meanings

Q: Sentence (1) Fall into a strange way of thinking.
Sentence (2) Fall asleep.. Word: fall.
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A:
the same meaning