\(G_1\)

\(V_1=\{a,b,c,d,e,f,g\}\)

\(E_1=\{\{a,b\},\{a,d\},\{b,c\},\{b,d\},\{b,e\},\{b,f\},\{c,g\},\{d,e\}\text{,}\)

\(\{e,f\},\{f,g\}\}\text{.}\)