+-------+------+
| iddoc | idkw |
+-------+------+
|     1 |    1 |
|     1 |    2 |
|     1 |    3 |
|     1 |    4 |
|     2 |    5 |
|     2 |    6 |
|     2 |    7 |
|     2 |    8 |
|     3 |    5 |
|     3 |    6 |
|     3 |    7 |
|     3 |    8 |
+-------+------+