{HEAD ~ The service authentication code} is communicated to the user via the communications network and received, or entered, into {TAIL ~ an authentication device} associated with the user  
{ HEAD ~ The service authentication code } is communicated to the user via the communications network and received , or entered , into { TAIL ~ an authentication device } associated with the user
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH