In a space between the wall and bag, {TAIL ~ a plurality} of {HEAD ~ pressure sensors} are positioned 
In a space between the wall and bag , { TAIL ~ a plurality } of { HEAD ~ pressure sensors } are positioned
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH