27970
The effect of using a viscoelastic suspending medium on the in - plane hydrodynamic interaction between two equally sized spheres in shear flow is studied experimentally to understand flow - induced assembly behavior ( i . e . , string formation ) .
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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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