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 man alone crosscountry skis in the wilderness while wearing a huge backpack.
Hypothesis: A man skis in the wilderness while it's snowing
Update: The fresh powder makes the skiing smooth.

SOLUTION: strengthener

PROBLEM: Premise: A brown dog is playing with a white fluffy stuffed animal.
Hypothesis: A dog is playing with a stuffed bear.
Update: The stuffed animal has long ears.

SOLUTION: weakener

PROBLEM: Premise: A man in a helmet is riding a bike.
Hypothesis: The man in a helmet is riding a sports bike.
Update: The bike only has one gear.

SOLUTION:
weakener