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