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 blond boy in a blue t-shirt stands smiling before a craft of green nylon fabric.
Hypothesis: A boy is happy about his fabric choice.
Update: The boy's favorite color is green.
strengthener

Premise: A pipe with one hand on it.
Hypothesis: The pipe is broken.
Update: There is water flowing through the pipe.
weakener

Premise: A woman wearing red sneakers walking a black dog.
Hypothesis: The dog has a red collar.
Update: The dog's collar is bright and very visible.

weakener