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The role of theory in guiding and supporting experiment is detailed through a few examples , and the interplay of experiment and theory is discussed in terms of the information of physical and chemical interest that can be derived .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None