{HEAD ~ The method} 14 further comprising generate {TAIL ~ a least significant region} of the output mask responsive to: a third bit of the first mask, the third bit corresponding to the least significant region; and the bits of the second mask 
{ HEAD ~ The method } 14 further comprising generate { TAIL ~ a least significant region } of the output mask responsive to : a third bit of the first mask , the third bit corresponding to the least significant region ; and the bits of the second mask
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