CREATE TABLE table_15992 ("Case/Suffix" TEXT, "we two" TEXT, "you and I" TEXT, "you two" TEXT, "them two  ( the two ) " TEXT, "who-two" TEXT)

What is who-two where you and i is ng ban?
SELECT "who-two" FROM table_15992 WHERE "you and I" = 'ngœban'
SELECT "who-two" FROM "table_15992" WHERE "you and I" = 'ngœban'