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% EXOR-gate NORTH
\newsavebox{\exorn}
\savebox{\exorn}(6,11){
\begin{picture}(6,11)
\bezier{60}(0,2)(0,7)(3,9) % western section of pointed curve
\bezier{60}(6,2)(6,7)(3,9) % eastern section of pointed curve
\bezier{40}(0,2)(3,4)(6,2) % bottom curve (inner)
\bezier{40}(0,1)(3,3)(6,1) % bottom curve (outer)
\put(3,9){\line(0,1){2}} % output line
\put(1,0){\line(0,1){1.5}} % western input line
\put(5,0){\line(0,1){1.5}} % eastern input line
% NB intersection of input lines & back curve is estimated (not calculated)!
\end{picture}
}
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