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