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 men and a young boy in purple jacket hold out promotional flyer's.
Hypothesis: People hand out flyer's.
Update: There is a stack of flyers on a table next to them.

SOLUTION: strengthener

PROBLEM: Premise: A biker is racing downhill.
Hypothesis: driving competetion is going on
Update: Police officers on bikes are chasing the person

SOLUTION: weakener

PROBLEM: Premise: A group of people singing at night on a crowded street.
Hypothesis: The people are singing at a Christmas Eve concert.
Update: They have santa hats on.

SOLUTION:
strengthener