tyle="text-align:left;"> exercise </td>
   <td style="text-align:left;"> read_csv(
  simple_csv,
  col_types = list(x = col_double()),
  na = "."
) </td>
  </tr>
  <tr>
   <td style="text-align:left;"> controlling-column-types-7 </td>
   <td style="text-align:left;"> exercise </td>
   <td style="text-align:left;"> read_csv(
  another_csv,
  col_types = cols(.default = col_character())
) </td>
  </tr>
  <tr>
   <td style="text-align:left;"> controlling-column-types-8 </td>
   <td style="text