347352
The one-dimensional case An abstract definition A one-dimensional ( abstract ) infrastructure ( X , d ) consists of a real number R > 0 , a finite set X \ neq \ emptyset together with an injective map d : X \ to \ mathbb / R \ mathbb .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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