gen_all_excits_k_space_hubbard Subroutine

    subroutine gen_all_excits_k_space_hubbard(nI, n_excits, det_list)!, sign_list)

        integer, intent(in) :: nI(nel)
        integer, intent(out) :: n_excits
        integer(n_int), intent(out), allocatable :: det_list(:, :)

        integer(n_int), allocatable :: triple_dets(:, :), temp_dets(:, :)
        integer :: n_triples, save_excits

        call gen_all_doubles_k_space(nI, n_excits, det_list)!, sign_list)

        if (t_trans_corr_2body) then
            save_excits = n_excits
            ! also account for triple excitations
            call gen_all_triples_k_space(nI, n_triples, triple_dets)

            n_excits = n_excits + n_triples

            allocate(temp_dets(0:niftot, save_excits), source=det_list(:, 1:save_excits))

            deallocate(det_list)

            allocate(det_list(0:niftot, n_excits))

            det_list(:, 1:save_excits) = temp_dets

            det_list(:, save_excits + 1:n_excits) = triple_dets

        end if

        call sort(det_list, ilut_lt, ilut_gt)

        ! if we have HPHF turned on we want to "spin-purify" the excitation
        ! list
        if (tHPHF) then
            save_excits = n_excits

            if (allocated(temp_dets)) deallocate(temp_dets)

            allocate(temp_dets(0:NIfTot, n_excits), source=det_list)

            call spin_purify(save_excits, temp_dets, n_excits, det_list)

        end if

    end subroutine gen_all_excits_k_space_hubbard