{HEAD ~ Communications} between the system station and {TAIL ~ the node} for relaying can then be controlled accordingly 
between
{ HEAD ~ Communications } between the system station and { TAIL ~ the node } for relaying can then be controlled accordingly
HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH