
+-----+----+-----+
| cyl | am | mpg |
+=====+====+=====+
| 4   |    | 23  |
+-----+----+-----+
|     |    | 28  |
+-----+----+-----+
| 6   |    | 19  |
+-----+----+-----+
|     |    | 21  |
+-----+----+-----+
| 8   |    | 15  |
+-----+----+-----+
|     |    | 15  |
+-----+----+-----+ 
