In languages without Gender distinctions in the Singular, for any one non-Singular number, the existence of a Gender distinction in 1st person implies the same Gender distinction in 2nd person, which in turn implies the same Gender distinction in 3d person.
Standardized
When there are no gender distinctions in the singular, IF there is a gender distinction in 1st person, THEN there is the same gender distinction in 2nd person for any one non-singular number, and IF there is a gender distinction in 2nd person, THEN there is the same gender distinction in 3rd person.
This is a corrected version of Greenberg’s Universal 45 (see #520). See further Plank & Schellinger 1997.