CREATE TABLE table_50518 ("Nominative" CLOB, "Ergative" CLOB, "Dative" CLOB, "Genitive" CLOB, "Instrumental" CLOB, "Adverbial" CLOB)

What instrumental has tkven-i as the genitive?
SELECT "Instrumental" FROM table_50518 WHERE "Genitive" = 'tkven-i'
SELECT "Instrumental" FROM "table_50518" WHERE "Genitive" = 'tkven-i'