points
9
0 2 0
1 3 0
2 3 0
2.5 2.5 0
2.5 0.5 0
2 0 0
1 0 0
0 1 0
4 3 0
end points
lines
8
0 1
1 2
2 3
4 5
5 6
6 7
7 0
4 0
end lines