If the extension of the pronominal dual is limited and includes the 3rd person, all nouns or at least some of them (from the permissible classes) have a dual.
Standardized
IF the extension of the pronominal dual is limited and includes 3rd person, THEN all nouns (or at least some of them) have a dual.
1. Cf. #1122. 2. See discussion in Plank 1989: 310-11.