premise: A bird is flapping its wings on the water. hypothesis: The duck is swimming in the lake.
neutral: Not all birds are ducks. Water does not imply lake.|neutral: A bird can be many different types not just a duck.|neutral: Just because there is a bird does not mean it is a duck and just because it is flapping its wings does not mean that it is swimming.  Just because there is water does not mean it is a lake.