$coord
    0.00000000000000      0.00000000000000      0.00000000000000      c
    1.02022495761968     -1.76708146174709      0.00000000000000      h
    1.02022495761968      1.76708146174709      0.00000000000000      h
   -2.04044991523936      0.00000000000000      0.00000000000000      h
$redundant
     number_of_atoms             4
     degrees_of_freedom          1
     internal_coordinates        1
     frozen_coordinates          0
# definitions of redundant internals
   1 k  1.0000000000000 stre    1    2           val=   2.04045
         1 non zero eigenvalues  of BmBt
           1           1.000000000    1    0
         1
$user-defined bonds
$end
