premise: A view of bicyclists on a city street, riding in both directions, with red reflective safety cones dividing the two lanes. hypothesis: Bumper to bumper automobile traffic clogs the street.
contradiction: People driving automobiles are not bicyclists.|contradiction: You would not be able to ride bicycle in both directions if bumper to bumper traffic clogged the street.|contradiction: Bicyclists riding in both directions cannot be riding Bumper to bumper.