Further, for tracking the items, decrypting {HEAD ~ the unique codes} of a marked item to obtain {TAIL ~ the unique reference}, and creating and storing the tracking records in a unique storage location, where the unique reference refers to the unique storage location 
to obtain
Further , for tracking the items , decrypting { HEAD ~ the unique codes } of a marked item to obtain { TAIL ~ the unique reference } , and creating and storing the tracking records in a unique storage location , where the unique reference refers to the unique storage location
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH