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By Hurwitz 's theorem they are the only ones ; the sedenions , the next step in the Cayley–Dickson construction , fail to have this structure .
 Hurwitz, Cayley–Dickson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hurwitz, Cayley–Dickson