The multimedia content may be layered using multiple different layering approaches simultaneously, and {HEAD ~ access} to {TAIL ~ the different types} of layers may be offered simultaneously 
to
The multimedia content may be layered using multiple different layering approaches simultaneously , and { HEAD ~ access } to { TAIL ~ the different types } of layers may be offered simultaneously
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH