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Once a one-suiter has been shown (by perhaps bidding the long suit twice), we will need to clarify the exact distribution. These are the one-suiters:
These are listed with the most likely shapes on top. To this list, your system may add 5332 (much more likely than any of the above shapes) or just some of the 5332. There are quite a few one-suiters, and we will be ignoring the freak distributions, including a suit of eight cards or longer. Perhaps our system would have a way to handle these really long suits, maybe not. I will ignore the 5332 shape, as that is among our balanced distributions (see Intro to Relays - A 2D Relay Stayman).
OK, we have shown our longest suit, and relayer relays. We show:
These last three (steps 5-7) are Zoom. The word "numeric" shows that in answer to a further relay, we show the exact distribution using the numeric principle, as described in Intro to Relays - A 2D Relay Stayman. For step 3 above (7321), there are six possible distributions.
The various relay systems do all this somewhat differently. Some change the order above (like moving 7321 to the first step, because there are so many possible distributions to clarify). Moscito even throws some of the three-suiters in with the one-suiters. Symmetric Relay shows the long suit, then the short suit, then shows the exact distribution numerically. It is also possible to make an artificial bid that means one-suiter, instead of bidding the long suit twice.