0(1) element: null
1(2) element: PyWhileStatement
2(3) element: PyBinaryExpression
3(4,5) READ ACCESS: undefined1
4(13) element: null. Condition: undefined1:false
5(6) element: null. Condition: undefined1:true
6(7) READ ACCESS: undefined2
7(8,9) WRITE ACCESS: r
8(13) element: null. Condition: (r := undefined2()):false
9(10) element: null. Condition: (r := undefined2()):true
10(11) element: PyStatementList. Condition: undefined1 and (r := undefined2()):true
11(12) element: PyPrintStatement
12(1) READ ACCESS: r
13(14) element: PyWhileStatement
14(15) element: PyBinaryExpression
15(16,17) READ ACCESS: undefined3
16(22) element: null. Condition: undefined3:true
17(18) element: null. Condition: undefined3:false
18(19) READ ACCESS: undefined4
19(20,21) WRITE ACCESS: r2
20(25) element: null. Condition: (r2 := undefined4()):false
21(22) element: null. Condition: (r2 := undefined4()):true
22(23) element: PyStatementList. Condition: undefined3 or (r2 := undefined4()):true
23(24) element: PyPrintStatement
24(13) READ ACCESS: r2
25() element: null