mes() </td>
  </tr>
  <tr>
   <td style="text-align:left;"> reading-data-from-a-file-24 </td>
   <td style="text-align:left;"> exercise </td>
   <td style="text-align:left;"> read_delim(file = "data/delim_1.txt") </td>
  </tr>
  <tr>
   <td style="text-align:left;"> reading-data-from-a-file-25 </td>
   <td style="text-align:left;"> exercise </td>
   <td style="text-align:left;"> read_delim(file ="data/delim_2.txt", col_types = cols( population = col_integer(), date = col_date())) </td>
  </tr>
 