0 init
1 set check 1
2 add -1
3 add -1
4 add 1
5 add 0
6 add -1
7 add -3
8 add -3
9 add 0
10 constrain -1
11 constrain -4
12 constrain -3
13 constrain 2
14 constrain 3
15 constrain 1
16 constrain 1
17 constrain 0