la nitcion cusku di'e
>OK, tell me where the following fails:
>
>mi djuno ro lo du'u makau catra la lauras.
>
>= ro da
> ro de poi de du'u da catra la lauras.
> zi'epoi de jetnu
> zo'u:
> mi djuno de
These expansions usually fail with negative answers. If we
accept that "I know who killed Laura" must include the case
that when noone killed Laura, I know that noone killed Laura,
then the expansion fails. There is no true {de} such that
{de du'u da catra la lauras}, therefore your expansion
is vacuously true but makes no claim of knowledge. It would
be true even if I don't know that nobody killed Laura.