When {TAIL ~ the terminal} transmits {HEAD ~ an attribute certificate issuance request message} in response to this message, the terminal transmits an attribute certificate issuance message to the terminal  
When { TAIL ~ the terminal } transmits { HEAD ~ an attribute certificate issuance request message } in response to this message , the terminal transmits an attribute certificate issuance message to the terminal
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD 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