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