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: An African American man smiling.
Hypothesis: The man is showing his teeth to a doctor.
Update: The man is knocking on a door

SOLUTION: weakener

PROBLEM: Premise: A young boy jumping upside-down into a pool.
Hypothesis: A child playing a game of marco polo.
Update: The boy is trying to show off to the girls.

SOLUTION: weakener

PROBLEM: Premise: Four dogs playing in a field
Hypothesis: Some puppies are running.
Update: the dogs try to catch one another

SOLUTION:
strengthener