+-----+-----+---+------------+------------+
| a   | b   | i | x          | y          |
+-----+-----+---+------------+------------+
| pan | pan | 1 | 0.34679014 | 0.72680286 |
| eks | pan | 2 | 0.75867996 | 0.52215111 |
| wye | wye | 3 | 0.20460331 | 0.33831853 |
| eks | wye | 4 | 0.38139939 | 0.13418874 |
+-----+-----+---+------------+------------+
