Process 2000 begins with {TAIL ~ operation} 2002, where {HEAD ~ the reader} retrieves at least a TPK and an ES from a tag 
Process 2000 begins with { TAIL ~ operation } 2002 , where { HEAD ~ the reader } retrieves at least a TPK and an ES from a tag
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH