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

SOLUTION: weakener

PROBLEM: Premise: A woman is sitting on a chair outdoors with a microphone near her mouth and an instrument on her lap.
Hypothesis: A woman sings into a microphone.
Update: She begins to hum and play her instrument.

SOLUTION: strengthener

PROBLEM: Premise: Fruit and Vegetable stand nicely arranged with two men in the back.
Hypothesis: Men are selling their fruits and vegetables at a city market.
Update: There are people walking down the street looking.

SOLUTION:
strengthener