{HEAD ~ Such a propagated signal} may take any of {TAIL ~ a variety} of forms, including, but not limited to, electro magnetic, optical, or any suitable combination thereof, 
{ HEAD ~ Such a propagated signal } may take any of { TAIL ~ a variety } of forms , including , but not limited to , electro magnetic , optical , or any suitable combination thereof ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH