{HEAD ~ A method}, device, and system for controlling {TAIL ~ a flow} of a fluid moving through a pipe are presented 
for controlling
{ HEAD ~ A method } , device , and system for controlling { TAIL ~ a flow } of a fluid moving through a pipe are presented
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH