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Instead , two different versions of string theory , type IIA and type IIB , can be compactified on completely different Calabi–Yau manifolds giving rise to the same physics .
 Calabi–Yau
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Calabi–Yau