TASK DEFINITION: In this task, you are given a premise, a hypothesis, and an update. The premise sentence describes a real-world situation and is always assumed to be true. The hypothesis sentence describes an assumption or inference that you might make about that situation having read the premise. The update provides additional information about the situation that might weaken or strengthen the hypothesis. A weakener is a statement that weakens the hypothesis, that is, it makes you much less likely to believe the hypothesis is true. A strengthener is a statement that strengthens the hypothesis, that is, it makes you much more likely to believe the hypothesis is true. Your task is to answer with 'strengthener' or 'weakener' if the update strengthens or weakens the hypothesis, respectively.
PROBLEM: Premise: Two smiling people with dark hair.
Hypothesis: Two people are happy and smiling at a joke.
Update: They are at a comedian's performance.

SOLUTION: strengthener

PROBLEM: Premise: In the foreground, a soccer player wearing orange and black moves to intercept two players wearing white uniforms as they run towards the camera in pursuit of the soccer ball while in the background a man in a blue soccer uniform looks on.
Hypothesis: As a soccer player moves to intercept, he is making a foul on the play.
Update: The player he is running towards falls to the ground.

SOLUTION: strengthener

PROBLEM: Premise: When cars are all self driving, or we move away from commuting too much as we do, these will be seen only in museums.
Hypothesis: A few cars are self-driving.
Update: The cars are Tesla self-driving models.

SOLUTION:
strengthener