{TAIL ~ An erodible device} is disclosed for delivering an agent to an environment of {HEAD ~ use} 
{ TAIL ~ An erodible device } is disclosed for delivering an agent to an environment of { HEAD ~ use }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD