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Antihydrogen can be trapped in such a magnetic minimum ( minimum-B ) trap ; in November 2010 , the ALPHA collaboration announced that they had so trapped 38 antihydrogen atoms for about a sixth of a second .
 ALPHA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 ALPHA