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The number of molecules in 22.4 liters of gas at standard temperature and pressure is roughly 6.022 × 10 ( the Avogadro number ) .
 Avogadro
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Avogadro