{TAIL ~ The device} contains a plurality of bristles secured to the inner surface of {HEAD ~ the inner wall} 
{ TAIL ~ The device } contains a plurality of bristles secured to the inner surface of { HEAD ~ the inner wall }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD