| 0(1) element: null | |
| 1(2) element: PyAssignmentStatement | |
| 2(3) element: PySetCompExpression | |
| 3(4,8) element: PyParenthesizedExpression | |
| 4(5) element: PyTargetExpression: x | |
| 5(6) WRITE ACCESS: x | |
| 6(7) element: PyReferenceExpression: x | |
| 7(4,8) READ ACCESS: x | |
| 8() element: null |