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Additionally , selected ( co ) - pyrolyses between the chlorinated ethylenes , CH2Cl2 , C4Cl4 , C4Cl6 , and C2H2 have been performed to explicitly probe the roles of 2C3 and C4 / C2 reaction pairs in aromatic growth .
 Chemical: chlorinated ethylenes; Chemical: CH2Cl2; Chemical: C4Cl4; Chemical: C4Cl6; Chemical: C2H2; Chemical: 2C3; Chemical: C4; Chemical: C2
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: chlorinated ethylenes; Chemical: CH2Cl2; Chemical: C4Cl4; Chemical: C4Cl6; Chemical: C2H2; Chemical: 2C3; Chemical: C4; Chemical: C2