xe'enai PA*4 cmavo-compound

digit/number: specific referent; modifies quantifier to indicate that there are particular referents that fulfill the predicate

(xe'e pa prenu) = "any one person / one non-specific person", (xe'enai pa prenu) = "one specific person". See itca, steci, su'anai

In notes:

xe'e (exp!)
digit/number: any/non-specific referent; modifies quantifier to indicate that it is not important what the specific members of the referential set are