0(1) element: null
1(2) element: PyAssignmentStatement
2(3) READ ACCESS: read
3(4) WRITE ACCESS: a
4(5) element: PyIfStatement
5(6,10) READ ACCESS: a
6(7) element: PyStatementList. Condition: a.startswith("Exit"):true
7(8) element: PyExpressionStatement
8(9) element: PySubscriptionExpression
9(14) READ ACCESS: a
10(11) element: PyElsePart. Condition: a.startswith("Exit"):false
11(12) element: PyPrintStatement
12(13) READ ACCESS: a
13(14) element: PyExpressionStatement
14() element: null