If an alternative mask is utilized, having a mask exhaust valve 62 , {HEAD ~ the stimulus} is directed to the patient will provide {TAIL ~ a reminder} for the patient to check whether the exhaust valve 62 is blocked against a pillow or clothing 
provide
If an alternative mask is utilized , having a mask exhaust valve 62 , { HEAD ~ the stimulus } is directed to the patient will provide { TAIL ~ a reminder } for the patient to check whether the exhaust valve 62 is blocked against a pillow or clothing
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH