v0.1-M2/chi/tutorial/pictures/assembly_two_components.tex

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{\ttfamily
\begin{tikzpicture}[x=1ex,y=1ex,thin,>=triangle 45,auto]
\path
            node(G0){}
++ ( 0,-10) node(G1){}
++ (12, 10) node[proc](B0){B}
++ ( 0,-10) node[proc](B1){B}
++ (14,  5) node[proc](S){S}
++ (12,  0) node(E){};
\path (G0) edge node{a[0]} (B0)
      (G1) edge node{a[1]} (B1)
      (B0) edge node[above]{c[0]} (S)
      (B1) edge node[below]{c[1]} (S)
      (S) edge node{b} (E);
\end{tikzpicture}
}