# No. of input segments followed by segments
2
-1 1 1 -1
1 1 -1 -1
# No. of output segments followed by segments
4
0 0 -1 -1
-1 1 0 0
0 0 1 -1
1 1 0 0
# No. of output points followed by points
5
-1 -1
-1 1
0 0
1 -1
1 1
# No. of intersection points followed by points
1
0 0
# No of faces: 1
# No. of output segments with overlaps followed by segments
4
0 0 -1 -1
-1 1 0 0
0 0 1 -1
1 1 0 0
