n:left;"> reading-data-from-multiple-fil-9 </td>
   <td style="text-align:left;"> exercise </td>
   <td style="text-align:left;"> list.files("data", pattern = "sales", full.names = TRUE) %&gt;%
  map_dfr(read_csv, show_col_types = FALSE, id = "file") </td>
  </tr>
  <tr>
   <td style="text-align:left;"> writing-to-a-file-1 </td>
   <td style="text-align:left;"> exercise </td>
   <td style="text-align:left;"> students2 &lt;- students |&gt; 
  clean_names() |&gt; 
  mutate(
    meal_plan = factor(m