::: {.cell layout-align="center"}

```{.r .cell-code}
p1 + p2 + p3 + p4 + plot_annotation(title = "Diamonds data", tag_levels = c("A","1"))
```

::: {.cell-output-display}
![](ggplot2_basics_slides_files/figure-revealjs/unnamed-chunk-32-1.png){fig-align='center' width=960}
:::
:::