no can mean "no, you don't need that you simply want it, so no", and it can mean "what you ask for is not going to be good for you, so no" other times it simply means no...
no can mean "no, you don't need that you simply want it, so no", and it can mean "what you ask for is not going to be good for you, so no" other times it simply means no...
The denial of one possibility is logically necessary for mutually exclusive possibilities to come to fruition.