Based on {HEAD ~ the value} of {TAIL ~ the corresponding payload bit}, the embedder will replace the original block of bits with the block of bits corresponding to one or the other alternative block of bits 
of
Based on { HEAD ~ the value } of { TAIL ~ the corresponding payload bit } , the embedder will replace the original block of bits with the block of bits corresponding to one or the other alternative block of bits
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH