\begin{equation*} G_1 = (V_1, E_1) \text{ where } V_1 = \{a, b, c\} \text{ and } E_1 = \{\{a,b\}, \{a,c\}, \{b,c\}\}; \end{equation*}

\begin{equation*} G_2 = (V_2, E_2) \text{ where } V_2 = \{u,v,w\} \text{ and }E_2 = \{\{u,v\}, \{u,w\}, \{v,w\}\}. \end{equation*}