47. As shown in the figure, $A B / / C D / / E F / / G H, A E / / D G$, point $C$ is on $A E$, point $F$ is on $D G$. Let the number of angles equal to $\angle \alpha$ be $m$ (excluding $\angle \alpha$ itself), and the number of angles supplementary to $\angle \beta$ be $n$. If $\alpha \neq \beta$, then the value of $m+n$ is $\qquad$.
Answer: 11