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: An icy, snowy city street with a bike resting against a pole.
Hypothesis: The bike is covered in snow.
Update: There are fresh tire track behind the bike.

SOLUTION: weakener

PROBLEM: Premise: A man in costume drums in a parade.
Hypothesis: There is a man playing drums on a float.
Update: The man is marching with the rest of his band.

SOLUTION: weakener

PROBLEM: Premise: A family is hiking across a rocky landscape.
Hypothesis: A family is taking a vacation in the mountains.
Update: The family poses for a photo at the top of the mountain.

SOLUTION:
strengthener