#rate_of_flow__flow__flow_rate  the amount of fluid that flows in a given time
  supertype:  #rate  a magnitude or frequency relative to a time unit; "they traveled at a rate of 55 miles per hour"; "the rate of change was faster than expected"
  subtype:  #cardiac_output__cardiacoutput  the amount of blood pumped out by the ventricles in a given period of time; "a resting adult has a cardiac output of about three quarts a minute"

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