# N = 0
0

# N = 1
1
2 3 3

# N = 2, s1 is s2
2
2 3 3
2 3 3

# N = 2, s1 includes s2
2
2 3 3
2 2.5 1

# N = 2, s1 intersects s2 (non-trivial)
2
2 3 3
9 6 4

# N = 2, s2 has negative x co-ordinate
2
2 3 3
-3 2 4

# N = 2, s2 has negative y co-ordinate
2
2 3 3
3 -2 4

# N = 5
5
2 3 3
5 8 1
4 1 3.5
9 6 2
4 10 4
