11886
The specific modulus of trGNR fibers is higher than that of the commercial general purpose carbon fibers and commonly used metals such as Al , Cu , and steel .
 Chemical: carbon; Chemical: Al; Chemical: Cu; Chemical: steel
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: carbon; Chemical: Al; Chemical: Cu; Chemical: steel