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The theoretical predictions also correctly describe the isotopic effects in line positions and intensities due to the CH4 --> CD4 substitution which is considered as the test for the method .
 Chemical: CH4; Chemical: CD4
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: CH4; Chemical: CD4