Q: Sentence (1) A hard theory to put into practice.
Sentence (2) It is not the local practice to wear shorts to dinner.. Word: practice.
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A: different meanings

Q: Sentence (1) A variant of the same word.
Sentence (2) All breeds of dog are variants of the species "Canis lupus familiaris".. Word: variant.
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A: the same meaning

Q: Sentence (1) If I had my way.
Sentence (2) Come this way and I'll show you a shortcut.. Word: way.
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A:
different meanings