  ![Toy data set with ground truth $\XtoY$. Shown is the dependency DAG (right). More dependencies go from $X$ to $Y$ than vice versa. Left: Example coding tree for $Y_0$. $X_0$ splits the values of $Y_0$ into two subsets. In addition, the subset belonging to the left child can be further compressed by regressing on $X_0$.[]{data-label="fig:toy:example"}](lepus_