step 9
In the MO checklist: Determine if any mixing occurs and draw the final MOs.
However, this is one of the few examples in MO theory where the qualitative MOs are not easily determined, so if you have trouble determining the mixing you are not alone!
Which orbitals do you think will mix together and why?
you don't need to try mixing them ...
Qualitative MO theory is, like all other theories, not perfect!