Should I swap group order and sum results for hydrogen bond counts when using `gmx hbond`?

Hello everyone,

Could you please guide me on whether it’s necessary to run gmx hbond twice? That said, for two different groups without overlapping, first input Group1 and then input Group2 in the prompt window. And then swapping the order (first Group2 and then Group1), and finally summing the results as the hydrogen-bond count between the two groups? I read the manual, but it seems this particular aspect is not clearly mentioned. Any help would be greatly appreciated.