NFL season NFL season NFL season NFL season NFL season NFL season NFL regular-season regular season NFL season variety in opponents NFL regular season NFL season NFL season NFL regular season NFL season 17-week regular season NFL Season NFL regular season 17-week regular season NFL season 17-week regular season NFL season NFL season NFL season NFL season NFL season NFL regular season seasons NFL regular season formula NFL season NFL season NFL's system as described at Wikipedia NFL season NFL season NFL regular season NFL season NFL season