[SECTOR]
1 0 8 0.0 5.0
2 8 3 1.0 4.0
3 11 4 0.2 6.0
4 15 5 0.0 3.0

[WALL]
# SECTOR 1: 0..7
4 1 2 1 0
5 2 4 1 0
5 3 5 2 0
4 4 5 3 3
2 4 4 4 0
1 3 2 4 2
1 2 1 3 0
2 1 1 2 0

# SECTOR 2: 8..10
2 4 1 3 1
1 5 2 4 0
1 3 1 5 0

# SECTOR 3: 11..14
5 3 4 4 1
6 5 5 3 0
6 7 6 5 4
4 4 6 7 0

# SECTOR 4: 15..19
7 4 6 5 0
8 5 7 4 0
8 7 8 5 0
6 7 8 7 0
6 5 6 7 3