1 array 4 2
2 zero 1
3 var 1
4 concat 2 2 -3
5 zero 4
6 write 4 2 1 -4 -5
7 eq 1 6 1
8 var 1
9 eq 1 -7 -8
10 and 1 3 7
11 and 1 -9 10
12 root 1 11