This is performed by identifying {HEAD ~ conditions} necessary to change a coded syntax element without disrupting the interpretation of {TAIL ~ subsequent coded elements} 
This is performed by identifying { HEAD ~ conditions } necessary to change a coded syntax element without disrupting the interpretation of { TAIL ~ subsequent coded elements }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL