\begin{Bmatrix}\frac{2}{3}P\\ -\frac{20}{27}P \\ -\frac{4}{27}PL \\ \frac{1}{3}P \\ -\frac{7}{27}P\\ +\frac{2}{27}PL \end{Bmatrix} + \begin{Bmatrix}0 \\ +\frac{13}{54}qL \\ -\frac{1}{108}qL^2 \\ 0 \\ -\frac{31}{54}qL \\ \frac{1}{324}qL^2 \end{Bmatrix} +