{HEAD ~ Operating means} are provided for operating {TAIL ~ the first service} in connection with the second service, so that the first service can utilize the second channel 
are provided for operating
{ HEAD ~ Operating means } are provided for operating { TAIL ~ the first service } in connection with the second service , so that the first service can utilize the second channel
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH