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