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Location: Chapter 25, solution to Problem 2

Solution given

$\Delta = W(DC\circledast\delta)$

$\Delta '=S\circledast\delta$

The second solution performs the duty of a Normalizer bird,

$\Delta\,\overline{n}=\circledast \overline{n} (\delta\,\overline{n})\;,$

just as the first one does.