{HEAD ~ The velocity} of {TAIL ~ the progression} is determined by the given distance of the fixtures at a given frequency 
of
{ HEAD ~ The velocity } of { TAIL ~ the progression } is determined by the given distance of the fixtures at a given frequency
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH