This selection ensures that one of the preferred channels will always be used by any multi carrier system regardless {HEAD ~ the location} of {TAIL ~ its center channel} 
This selection ensures that one of the preferred channels will always be used by any multi carrier system regardless { HEAD ~ the location } of { TAIL ~ its center channel }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL