Among {TAIL ~ the alternatives}, {HEAD ~ the methods} of improvements in frequency diversity, space diversity, and adaptive programmable channel equalization are brought forth 
Among { TAIL ~ the alternatives } , { HEAD ~ the methods } of improvements in frequency diversity , space diversity , and adaptive programmable channel equalization are brought forth
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH