  \[lem-def0a\] Suppose that $h:B'\rightarrow B$ is type (Ia). Then we have exact sequences: $$\begin{aligned} 0 \rightarrow H^0(E,T_E(-D)) \rightarrow \mathbb{H}^0(B',L_{(f',i')}^\vee) \rightarrow  \mathbb{H}^0(B, L_{(f,i)}^\vee) \rightarrow 