H
Al   1 alh2    
xx   2 xxal3       1 xxalh3    
P    2 pal4        3 palxx4        1 dih4   
variables
alh2        1.61334076
pal4        2.11591469
xxal3       1.000000
xxalh3       90.000
palxx4       90.000
dih4        180.000