At operation 2006 the reader verifies the TPK using {TAIL ~ the SAPK} and {HEAD ~ ES} 
At operation 2006 the reader verifies the TPK using { TAIL ~ the SAPK } and { HEAD ~ ES }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD