I'm using this: https://www.atb.bergamo.it/en/google-transit
And I'm completely lost. I just discovered that buses have their "subnumbers" so line 6 has 6A, 6B, 6C and 6 - Stezzano, ok that's fine, but I'm looking at a timetable for bus 6 for example: https://www.atb.bergamo.it/en/atb-network/routes-and-timetables and how should I interpret these tables? I mean, I can see on top all kind of "sixes" that are running around and I have timetables but I don't see how any of these tables relate to any specific "six". How should I read these tables to extract the information: at which times 6B departures Porta Nuova - for example?