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 boy in a black shirt punches a yellow punching bag while a boy in a blue sweatshirt holds the bag.
Hypothesis: Two boys take turns using a punching bag.
Update: They are both training.
strengthener

Premise: Many people sitting at the bar with drinks in front of them.
Hypothesis: Two couples have drinks at the bar together.
Update: All of the people are men.
weakener

Premise: Spectators sit in the audience at a hockey game while a photographer takes pictures from a box in between the opposing teams.
Hypothesis: The crowd is mostly dressed in the same colour.
Update: The crowd spends lavishly on their team's merchandise.

strengthener