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Moreover , the role of heterogeneity on the strain was investigated , and reduced strain energies in Ar - Kr - Xe clusters were studied to find possible ways of reducing strain .
 Chemical: Ar; Chemical: Kr; Chemical: Xe
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Ar; Chemical: Kr; Chemical: Xe