When the surgeon determines which of the surgical instrument holders 10, 40, 50 is required for a given surgical procedure, {HEAD ~ the surgeon} selects {TAIL ~ one or more packages} 36 containing the holders 10, 40, or 50 
selects
When the surgeon determines which of the surgical instrument holders 10 , 40 , 50 is required for a given surgical procedure , { HEAD ~ the surgeon } selects { TAIL ~ one or more packages } 36 containing the holders 10 , 40 , or 50
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH