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: A young man goes air-born while his skateboard spins underneath him.
Hypothesis: The man is not wearing a helmet.
Update: His hair is flying in front of his face.

SOLUTION: strengthener

PROBLEM: Premise: A pipe with one hand on it.
Hypothesis: The pipe is broken.
Update: The pipe was as good as new.

SOLUTION: weakener

PROBLEM: Premise: People sitting on a bench watching a man play his guitar
Hypothesis: The man has a big audience
Update: The man is in a playing an acoustic guitar.

SOLUTION:
weakener