1    18  Water Hexamer Prism Structure
2     1  O      1.762494    0.620064   -1.224927     1     2     3
3     2  H      1.852017    0.583516   -0.261185     2     1
4     3  H      2.512824    1.117656   -1.556673     2     1
5     4  O     -1.935627   -1.158001   -0.239573     1     5     6
6     5  H     -1.065122   -1.582312   -0.297144     2     4
7     6  H     -2.584834   -1.849643   -0.383799     2     4
8     7  O      0.695656   -1.931228   -0.332851     1     8     9
9     8  H      1.068290   -1.434963   -1.071308     2     7
10     9  H      1.040191   -1.490109    0.455703     2     7
11    10  O     -1.070730    0.951376    1.499601     1    11    12
12    11  H     -1.063287    1.481807    0.688293     2    10
13    12  H     -1.571460    0.163819    1.244605     2    10
14    13  O     -1.009422    1.442627   -1.222232     1    14    15
15    14  H     -0.083959    1.226510   -1.391055     2    13
16    15  H     -1.482145    0.602169   -1.204483     2    13
17    16  O      1.484074    0.105281    1.506847     1    17    18
18    17  H      1.958331    0.251326    2.329701     2    16
19    18  H      0.586318    0.452298    1.655744     2    16
20