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In this work , sPS gels are prepared by thermo - reversible gelation in tetrahydrofuran in the presence of PEO .
 sPS, tetrahydrofuran, PEO
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 sPS, tetrahydrofuran, PEO