points
13
0.0 1.5 0
0.0 2.0 0
1.0 3.0 0

2.0 3.0 0
3.0 2.0 0
3.0	-2.0 0
2.0 -3.0 0
1.0 -3.0 0
0.0 -2.0 0
0.0 -1.0 0
1.0 -0.0 0
2.0 -0.0 0
3.0 -1.0 0

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