# system with periodic bonds in both x and y

9 atoms
18 bonds

1 atom types
1 bond types

0 3 xlo xhi
0 3 ylo yhi

Atoms

1 1 1 0.5 0.5 0
2 1 1 1.5 0.5 0
3 1 1 2.5 0.5 0
4 1 1 0.5 1.5 0
5 1 1 1.5 1.5 0
6 1 1 2.5 1.5 0
7 1 1 0.5 2.5 0
8 1 1 1.5 2.5 0
9 1 1 2.5 2.5 0

Bonds

1 1 1 2
2 1 2 3
3 1 3 1
4 1 4 5
5 1 5 6
6 1 6 4
7 1 7 8
8 1 8 9
9 1 9 7
10 1 1 4
11 1 4 7
12 1 7 1
13 1 2 5
14 1 5 8
15 1 8 2
16 1 3 6
17 1 6 9
18 1 9 3