C
xx    1 xxc2    
H    1 hc         2 hcxx     
H    1 hc         2 hcxx         3 dih4   
H    1 hc         2 hcxx         3 dih5   
variables
hc         1.1044096
hcxx       110.86218699
xxc2        1.000000
dih4        120.000
dih5        240.000