316586
Definitions Alternating fluid currents Considering any flow or pipes , if : and then we have : Assuming that the fluid current is produced by a piston having a simple harmonic movement , in a piston cylinder having a section Ω .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None