premise: A white duck is spreading its wings while sitting on the water. hypothesis: The duck kept it's wings intact when it dived under the water to catch some fish.
contradiction: The duck cannot be sitting on the water and diving under the water simultaneously.|contradiction: A duck cannot be spreading it's wings while it also kept it's wings intact. It also cannot be sitting on the water when it dived under the water.|contradiction: the duck can't be sitting on the water if he dove under it.