ata-from-multiple-fil-8 </td>
   <td style="text-align:left;"> exercise </td>
   <td style="text-align:left;"> read_csv(list.files(path = "data" , pattern = "sales", full.names = TRUE)) </td>
  </tr>
  <tr>
   <td style="text-align:left;"> reading-data-from-multiple-fil-9 </td>
   <td style="text-align:left;"> exercise </td>
   <td style="text-align:left;"> read_csv(list.files(path = "data" , pattern = "sales", full.names = TRUE), id = "file") </td>
  </tr>
  <tr>
   <td style="text-align:left;"> 