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As in other ornithomimids but unusually among theropods , the three fingers were roughly the same length , and the claws were only slightly curved ; Henry Fairfield Osborn , describing a skeleton of " S. altus " in 1917 , compared the arm to that of a sloth .
 Henry Fairfield Osborn
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Henry Fairfield Osborn