::: {.cell hash='03_Data_preprocessing_cache/revealjs/unnamed-chunk-6_dd7b191485c3d09511131c75fa31b2ef'}

```{.r .cell-code}
read_csv("data/example_na.csv", 
         na=c("", ":"))
```

::: {.cell-output .cell-output-stdout}
```
# A tibble: 4 × 3
  state  year energy
  <chr> <dbl>  <dbl>
1 DE     2015   8.80
2 IT     2015  NA   
3 DE       NA   8.92
4 IT     2016  10.1 
```
:::
:::