Y_{2,3} =\left( \begin{array}{c}
P_{k-l}(t) \\
... \\
Q_{k-l}(t) \\
\end{array} \right) e^t = \{ k=3, l=1 \} = \left( \begin{array}{c}
at^2 + bt + c \\
dt^2 + et + f \\
gt^2 + ht + i \\
\end{array} \right) e^t