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: People in blue t-shirts stand in the grass.
Hypothesis: People in blue t-shirts stand around talking about their lives.
Update: They are looking at pictures of one another's vacations on their smartphones.
[EX A]: strengthener

[EX Q]: Premise: A woman with red-hair and a black hat is standing in front of pictures.
Hypothesis: The woman wearing the black hat has red hair.
Update: The woman dyes her hair.
[EX A]: weakener

[EX Q]: Premise: A man is pulled behind a boat on a knee board while another doing the same begins to fall.
Hypothesis: Two men are enjoying a night in the river.
Update: The man breaks a bone while kneeboarding.
[EX A]:
weakener