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.

[EX Q]: Premise: Young women practicing marshal arts in a gym.
Hypothesis: A group of women doing Tai Chi at the gym.
Update: The women are part of a class.
[EX A]: strengthener

[EX Q]: Premise: Two smiling people with dark hair.
Hypothesis: Two people are happy and smiling at a joke.
Update: They are at a comedian's performance.
[EX A]: strengthener

[EX Q]: Premise: A boy wearing green shorts is about to serve a volleyball.
Hypothesis: A boy is playing ball with other students.
Update: A gym teacher watches the game.
[EX A]:
strengthener