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Together they devised the first Hardy–Littlewood conjecture , a strong form of the twin prime conjecture , and the second Hardy–Littlewood conjecture .
 person: Hardy–Littlewood; person: Hardy–Littlewood
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Hardy–Littlewood; person: Hardy–Littlewood