The first and second adhesive strips and the Y site identification element are contained within {TAIL ~ a packet} having {HEAD ~ an openable side} 
The first and second adhesive strips and the Y site identification element are contained within { TAIL ~ a packet } having { HEAD ~ an openable side }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD