21688
We compare the rearrangement of the pure water surface by EE and FEE monolayers and the conformations of EE and FEE polar heads .
 Chemical: FEE; Chemical: FEE
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: FEE, FEE 
Answer:
 Chemical: FEE; Chemical: FEE