The number of levels of {TAIL ~ logic} required to generate {HEAD ~ the mask} may be reduced, which may provide for mask generation at higher clock frequencies than previously possible 
The number of levels of { TAIL ~ logic } required to generate { HEAD ~ the mask } may be reduced , which may provide for mask generation at higher clock frequencies than previously possible
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH