Q: Sentence (1) The formation of crystals.
Sentence (2) The formation of gas in the intestine.. Word: formation.
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A: the same meaning

Q: Sentence (1) 200 head of cattle.
Sentence (2) 200 head of cattle and 50 head of horses.. Word: head.
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A: the same meaning

Q: Sentence (1) I shall be writing to you soon.
Sentence (2) The woman is walking.. Word: be.
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A:
the same meaning