In {TAIL ~ some alternative embodiments}, terminal 501 m might communicate via other means with {HEAD ~ content terminal 502 n} 
In { TAIL ~ some alternative embodiments } , terminal 501 m might communicate via other means with { HEAD ~ content terminal 502 n }
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD