{HEAD ~ The collection surface} of the swab thus maintains {TAIL ~ contact} with the rehydrated media plug 
maintains
{ HEAD ~ The collection surface } of the swab thus maintains { TAIL ~ contact } with the rehydrated media plug
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH