The speed of propagation is predetermined by {TAIL ~ the inherent characteristics} of {HEAD ~ the wave} and the medium chosen 
The speed of propagation is predetermined by { TAIL ~ the inherent characteristics } of { HEAD ~ the wave } and the medium chosen
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH