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.
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Question: Premise: A young girl is holding an end of the string of a yo-yo in one hand and the body of the pink yo-yo in the other.
Hypothesis: A girl is holding a yo-yo for her friend.
Update: The girl does tricks with the yo-yo.

Answer: weakener


Question: Premise: A man is moving a gate that impedes the progress of an oncoming train.
Hypothesis: The railroad worker is completing his last task for the day.
Update: The worker is very tired.

Answer: strengthener


Question: Premise: Two dogs on leashes straining toward each other while their owners walk away from each other.
Hypothesis: The dogs hate eachother.
Update: The two male dogs are very aggressive towards each other.

Answer:
strengthener