27973
These include a reference Newtonian fluid ( N ) , a constant - viscosity , high - elasticity Boger fluid ( BF ) , a wormlike micellar surfactant solution with a single dominant relaxation time ( WMS ) , and a broad spectrum shear - thinning elastic polymer solution ( ST ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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