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