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.

[Q]: Premise: PersonX knits PersonX's brows
Hypothesis: Because PersonX wanted to understand something
Update: PersonX is looking at a calculus book.
[A]: strengthener


[Q]: Premise: PersonX sends PersonX's friend
Hypothesis: PersonX then personX anticipates what will happen after she sends her friend to confront somebody
Update: PersonX is intensely anxious.
[A]: strengthener


[Q]: Premise: PersonX wipes PersonX's forehead
Hypothesis: Before, PersonX needed to have sun shine on body
Update: PersonX has a high fever
[A]:
weakener