Although it occurs only immediately before selbri, {na} is a wide-scope negative, that is, its scope is the entire bridi in which it occurs. In other places, {naku} must be used, but its scope extends only rightward from its position. Thus {da na broda} = {naku da broda}={naku su'o da zo'u da broda}={ro da zo'u naku da broda}= {ro da naku broda}={roda broda naku}