##
1 2 1
2
^
1 < 0 > 1
####
1 2 1
1
^ ^
0 > < 0
####
0 > 2 < 0
v v
1
####
1 < 0 > 1
v
3 1 1 3
####
< 0 > < 0 >
v v
3 1 1 3
####
3 < 0 > < 0 > 3