A(f,e) = \left[ \begin{matrix} 1 & 1 & 1 \\ 1 & 0 & 0 \end{matrix} \right], I(e,e') = \left[ \begin{matrix} 1 & 1 & 0 \\ 1 & 0 & 0 \\ 0 & 1 & 1 \end{matrix} \right], I(f,f') = \left[ \begin{matrix} 1 & 1 \\ 1 & -2 \end{matrix} \right]