How can you be sure of that. How can you trust what your eyes tell your brain? No way the pairs are there. My body is starting to engorge with air I pump in it through the mouth opening trying to accumulate more gas in my lungs before interminable laughing routine. I can not explain nor fathom what raveled me in you statement but my body reacted unusually.
Well, since I use that exchange myself I can assure you that all pairs are there and all are active.