1. She is not only pretty but also smart. <br/><br/>2. She is not just pretty but smart too.<br/><br/>3. She is not just pretty but smart. <br/><br/>4. She is not pretty but smart. <br/><br/>I think sentence 4 is different from the others in meaning. Then, what about sentence 3? Is it the same as 1 and 2 or as 4?