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+\begin{pseudo}*
+
+ \hd{Backward}(V, E, v, i) \\
+
+ $v.\id{label} = i$ \\
+
+ for $(u,v)\in E$ \\+
+ if $0 < v.\id{label} < i$ \\+
+ \pr{Backward}(V, E, u, i) \\--
+
+ for $(u,v)\in E$ \\+
+ if $u.\id{label} \== 0$ \\+
+ \pr{Backward}(V, E, u, i+1)
+
+\end{pseudo}