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