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.

Premise: A man in an orange vest is working on a train.
Hypothesis: The train will head to Vermont once fixed.
Update: The man is from the midwest.
weakener

Premise: Two girls in red and blowing bubbles with gum.
Hypothesis: One child has challenged another to blow the biggest bubble.
Update: The girls are carefully controlling their breathing to make the bubbles bigger.
strengthener

Premise: A BMX rider airborne on his bike
Hypothesis: A rider performs a stunt at a bike show.
Update: The biker practices riding for many hours to perfect his skills.

weakener