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The applied depolymerization conditions , which take advantage of the use of formic acid as a hydrogen - donating solvent , did not generate any biochar in the systems .
 Chemical: formic acid; Chemical: hydrogen
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: formic acid; Chemical: hydrogen