points
10
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 -3 0
4 3 0
end points
lines
10
0 1
1 2
2 3
3 4
4 5
5 6
6 7
7 0
4 8
3 9
end lines