Hi! It appears like the function `DAG.vstructures()` is wrongly documented in https://causaldag.readthedocs.io/en/latest/classes/generated/causaldag.classes.dag.DAG.vstructs.html#causaldag.classes.dag.DAG.vstructs In the documentation it appears as `DAG.vstructs()`, which returns an error when called. Besides that, thanks for an awesome and useful package!