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