Cartesian Coordinates

0 1
 C                  0.00000000   -0.00000000   -0.56232970
 H                  0.00000000   -0.92598746   -1.09949033
 H                 -0.00000000    0.92598746   -1.09949033
 O                  0.00000000    0.00000000    0.69610636

 1 2 1.0 3 1.0 4 2.0
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Internal Coordinates

0 1
 C              
 H                  1            B1
 H                  1            B2    2            A1
 O                  1            B3    3            A2    2            D1    0

   B1             1.07051124
   B2             1.07051124
   B3             1.25843606
   A1           119.76439424
   A2           120.11780288
   D1          -180.00000000

 1 2 1.0 3 1.0 4 2.0
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 3
 4