Items a) and b) should precede everything else in the input;
apart from this, commands may come in any order.
|a)|| For generating representations of CASSCF wavefunctions, the program
is invoked by the command CASVB.
For variational optimization of wavefunctions it is normally invoked
inside MULTI by the sub-command VB (see 19.10).|
|b)|| Definition of the CASSCF wavefunction (not generally required).|
|c)|| Definition of the valence bond wavefunction.|
|d)|| Recovery and/or storage of orbitals and vectors.|
|e)|| Manual input of starting guess (optional).|
|g)|| Optimization control.|
|f)|| Definition of molecular symmetry and possible constraints on
the VB wavefunction.|
|h)|| Wavefunction analysis.|
|i)|| Further general options.