```{r}
#| fig-cap: "The DAGs for the Causal Quartet."
#| fig-subcap: 
#|   - "The DAG for dataset 1, where `covariate` (c) is a collider."
#|   - "The DAG for dataset 2, where `covariate` (c) is a confounder."
#|   - "The DAG for dataset 3, where `covariate` (c) is a mediator."
#|   - "The DAG for dataset 4, where `covariate` (c) is a collider via M-Bias."
```
