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