"da" in conjunction with "na"

["Arnt-Richard Johansen" <broca@fix.no>]

What is the correct interpretation of sentences with both "da" 
and "na"? For instance, does "da na prane prenu" mean "There are no 
perfect people" (i.e. "(It is not 
the case that (there is one x so that (x is perfect person)))"), 
or "There is an imperfect person" (i.e. "(There is one x so that (it 
is not the case that (x is perfect 
person)))")?

co'o mi'e tsali