9291
We propose that this effect is due to the more rapid degradation of PFB hole - transport pathways in the F8BT - rich regions , resulting in a loss of percolation pathways for hole transport in the F8BT - rich phase .
 Chemical: PFB; Chemical: F8BT; Chemical: F8BT
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: PFB, F8BT, F8BT 
Answer:
 Chemical: PFB; Chemical: F8BT; Chemical: F8BT