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: Man carrying a tool box on a sidewalk
Hypothesis: The toolbox is red
Update: The toolbox has the man's lunch inside.

SOLUTION: weakener

PROBLEM: Premise: The woman in the blue sweater encourages the dog to jump in the air.
Hypothesis: A woman is training her dog for a competition.
Update: The dog is very obedient and in shape

SOLUTION:
strengthener