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In particular , H2O can occupy and transition among the xenon cavities , Xe4 , Xe2 , and Xe3 .
 H2O, xenon, Xe4, Xe2, Xe3
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 H2O, xenon, Xe4, Xe2, Xe3