1 array 1 1
2 array 1 1
3 var 1
4 var 1
5 var 1
6 var 1
7 var 1
8 var 1
9 var 1
10 var 1
13 acond 1 1 3 1 2
14 acond 1 1 4 2 1
15 acond 1 1 5 13 14
16 acond 1 1 6 14 13
17 acond 1 1 7 15 16
18 acond 1 1 8 16 15
19 acond 1 1 9 17 18
20 acond 1 1 10 18 17
21 var 1
22 read 1 19 21
23 read 1 20 21
24 eq 1 1 2
25 eq 1 22 23
26 and 1 24 -25
27 root 1 26