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