premise: Two workers stretch the canvas of the advertising billboard for free range chickens to be appended on a billboard. hypothesis: These two men are relaxing by the pool.
contradiction: You cannot be at the pool and working on a billboard at the same time.|contradiction: Two workers do not have to be men.  If the workers stretch the canvas of the advertising billboard they are not relaxing by the pool.|contradiction: Stretching and relaxing are not possible at the same time.