Comments: The PTs paradigm: *hǝ̃s:, obl. *s:ɨ-. The oblique base is preserved in Gunz. sɨ-d, Bezht. si-d; it is also reflected in the Tsez form sis which is a contamination of former direct and oblique bases. Cf. also Gunz. se-n 'everything', se-se 'some', very probably derived from the same root.
