points
13
0 2 0
1 3 0
2 3 0
3 2 0
3 1 0
2 0 0
1 0 0
0 1 0
3 5 0
0 5 0
1 6 0
2 6 0
3 5 0
end points
lines
13
0 1
1 2
2 3
3 4
4 5
5 6
6 7
7 0
3 8
8 12
9 10
10 11
11 12
end lines