Primitive E module for a NOR gate.
We use this to implement vl2014::*vl-1-bit-nor*.
Definition: *esim-nor*
(defconst *esim-nor* '(:n *esim-nor* :x (:out ((|out| not (or |a| |b|)))) :i ((|a|) (|b|)) :o ((|out|))))
