TASK DEFINITION: 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.
PROBLEM: Premise: A young african boy skipping rocks.
Hypothesis: There is a rock currently skipping down a pond.
Update: There are several expanding sets of rings on the surface of the pool.

SOLUTION: strengthener

PROBLEM: Premise: A man on a scaffold paints a wall with a paint roller.
Hypothesis: A man is painting a picture.
Update: He looks thoughtfully at his work then reaches for another roller in a tray with a different color of paint.

SOLUTION: strengthener

PROBLEM: Premise: Three girls in a marching band are wearing gold outfits and men are drumming behind them.
Hypothesis: Men drumming
Update: men are new members of the band

SOLUTION:
strengthener