In {TAIL ~ determination operation} 410, {HEAD ~ the ventilator system} determines if the response data are proper based on whether the response data are within an acceptable range or are the same as expected ventilator system response data 
In
In { TAIL ~ determination operation } 410 , { HEAD ~ the ventilator system } determines if the response data are proper based on whether the response data are within an acceptable range or are the same as expected ventilator system response data
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