Restart auto numbering when n=x

Question

Is it possible to have a context rule that resets the auto numbering after a certain value, e.g. if n=31, reset n=1.

*Structured FM17

It can happen that several subsequent instances of the same Element uses the same number, e.g. 5. I use an Attribute (Counter) to specify whether the counter remains the same or is incremented. I don't now when the counter will reach 31, so I need to have it automatically restart at 1 if the next <n> value is 32.

*Edited to add additional information/context

Bob_Niland · Answer

In unstructured FM, this is typically done by having two different ¶formats available, perhaps named:
Ordered[1]
and
Ordered[2+]

Manually, the author would look for the first instance where the latter results in a display of:
31. …content…
then apply Ordered[2+], then look for the next instance of 31.

Assuming a script has access to rendered content, it would be important to to this in order of document appearance, do the equivalent of an Apply, then start over, until no instances are found.

Whether done manually or via script, any ordered content added or deleted later requires the whole process to be run all over again, or there is going to be disrupted list numbering. Whether that could also be automated isn't something I have a guess on.

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