points
10
0 0 0
0 2 0
1 3 0
1.5 3 0
2.5 2 0
2.5 0 0
2.5 5 0
1.5 6 0
1 6 0
0 5 0
end points
lines
9
0 1
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
end lines