{casscf
closed,2                        !2 inactive orbitals in Symmetry 1 (a1)
occ,8,2,3                       !7a1, 2b1, 3b2 occupied orbitals
wf,16,1,0                       !16 electrons, Symmetry 1 (A1), singlet
restrict,0,2, 7.1,8.1,2.2,3.3   !max 2 electrons in the given orbital list
restrict,-1,0 7.1,8.1,2.2,3.3   !1 electron in given orbital space not
                                !allowed (no singles)
restrict,2,4, 3.1,4.1           !at least 2 and max 4 electrons in the
                                !given orbitals
restrict,-3,0,3.1,4.1}          !3 electrons in given orbital space not
                                !allowed (no singles)