sumti grammar oddity

I just noticed an oddity in the grammar of sumti. The EBNF rule for
sumti-tail (what comes after a gadri) is:

sumti-tail-1 = [quantifier] selbri [relative-clauses]
| quantifier sumti

I expected it to be:

sumti-tail-1 = [quantifier] selbri [relative-clauses]
| quantifier sumti-6

where sumti-6 is an unquantified, not connected sumti. A sumti is more
general than sumti-6, it can be quantified and connected with other
sumti-6.

So the grammar allows things like:

lo ci (ko'a .e ko'e)
lo ciboi re broda

I could make some sense of {lo ciboi re broda} interpreting it
as {lo ci lo re broda}, but what is {lo ci (ko'a e ko'e)}?

mu'o mi'e xorxes


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