A method of detection for parcels is to ensure {HEAD ~ separation} is performed by {TAIL ~ mechanical equipment} prior to directing the sensing devices towards the parcel 
is performed by
A method of detection for parcels is to ensure { HEAD ~ separation } is performed by { TAIL ~ mechanical equipment } prior to directing the sensing devices towards the parcel
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH