x1 knows fact(s) x2 (du'u) about subject x3 by epistemology x4.
Words usable for epistemology typically have a du'u place; know how to - implying knowledge of method but not necessarily having the ability to practice (= tadjyju'o). 'know/familiar with' - se slabu, na'e cnino, na'e fange. See also du'o, krici, jinvi, cilre, certu, facki, jijnu, jimpe, senpi, smadi, kakne, birti, mipri, morji, saske, viska.