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