$b_{2}=\left(2q^{\prime\prime}-\frac{2p^{\prime\prime\prime}q^{\prime}}{p^{%
\prime\prime}}+\left(\frac{5(p^{\prime\prime\prime})^{2}}{6(p^{\prime\prime})^%
{2}}-\frac{p^{\mathrm{iv}}}{2p^{\prime\prime}}\right)q\right)\frac{1}{(2p^{%
\prime\prime})^{3/2}},$