iagrams/functionals/map.png)&lt;!-- --&gt;

.footnote[From [Adv R](https://adv-r.hadley.nz/functionals.html)]

---
class: inverse

# üêà, üå©

Complete the code! Use a `dplyr` function to add the training data as a list column to the `lm_split` table.


```r
simple_split %&gt;%   __________________
```


```
## # # Monte Carlo cross-validation (0.75/0.25) with 1 resamples  
## # A tibble: 1 x 3
##   splits             id               train_set            
## * &lt;list&gt;             &lt;chr&g