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. It makes you much less likely to believe the hypothesis is true. A strengthener is a statement that strengthens the hypothesis. It makes you much more likely to believe the hypothesis is true. Your task is to output 'strengthener' or 'weakener' if the update strengths or weakens the hypothesis, respectively.

Premise: PersonX reduces PersonX's stress
Hypothesis: Because PersonX wanted to be calm
Update: PersonX is reading books on meditation
strengthener

Premise: PersonX greets PersonY
Hypothesis: PersonX is seen as glad
Update: PersonY looks angrily at PersonX.
weakener

Premise: PersonX invites PersonY to dinner
Hypothesis: PersonX is seen as pleased
Update: They say yes
strengthener