Of course, in alternative implementations {HEAD ~ the information element} may contain {TAIL ~ some information} somehow indicating that no duplication is to be performed etc., and if it is desired it may comprise a specific message or some other information elements that may be used 
contain
Of course , in alternative implementations { HEAD ~ the information element } may contain { TAIL ~ some information } somehow indicating that no duplication is to be performed etc . , and if it is desired it may comprise a specific message or some other information elements that may be used
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH