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.

Q: Premise: A man sawing wood on a fence.
Hypothesis: It's sunny outside while a man is cutting wood.
Update: The man is wearing a visor and sunglasses.

A: strengthener
****
Q: Premise: Two people are stick fighting in black Asian style warrior garments.
Hypothesis: A person instructing his student in sword fighting.
Update: One person motions to the other in how to hold and maneuver the sword.

A: strengthener
****
Q: Premise: A young boy wearing a yellow shirt and gray pants is playing at a creek.
Hypothesis: A boy is throwing a rock in a creek
Update: The banks of the creek are sandy with few big rocks.

A:
weakener
****