kau UI3a cmavo

discursive: marks word serving as focus of indirect question: "I know WHO went to the store".

On affix form:

x1 (property - ka) is common/general/universal among members of set x2 (complete set).

In definition:

si'o ze'ei du'u (comp!)
abstractor: x1 is x2's concept of [bridi] (proposition or {kau}-question)
x1 (du'u - fact or kau-question) is obscure (not easily understood) / unclear to x2
mau'a (exp!)
shortening of {lo du'u ma kau *bridi*}, with {ce'u} bound to {ma kau}
moi'a (exp!)
shortening of {lo du'u *sumti* mo kau}
xau'a (exp!)
shortening of {lo du'u xu kau *bridi*}
x1 (du'u with kau) is the indirect question of predicate relation x2 (ka), with answers x3 (sumti sequence)
x1 (du'u: proposition or kau-question) can be assigned a definite truth-value or answer
x1 (du'u: proposition or kau-question) cannot be assigned a definite truth-value or answer

In notes:

du'ukau (comp!)
bridi abstractor: x1 is the answer to the question x2
ju'oinai (comp!)
evidential: I don't know that...
x1 is the identity of x2
x1 is the identity function/equality relation
do'au (exp!)
pro-sumti whose referent's identity may be chosen by the listener
ja'u (exp!)
na'e fancuka modal: no matter (indirect question)...
ju'oi (exp!)
evidential: I know that...
nau'o (exp!)
pro-sumti whose referent's identity is unknown to the speaker
x1 (text, entity) is a palindrome in retaining x2 (by default x1) via rules x3 (property of x1)
x1 is curious / wonders which thing(s) satisfy x2 (ka).
x1 is verbose/overwrought to x2 by standard x3