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: Two little girls reading and a baby listening.
Hypothesis: The baby is the girl's sibling.
Update: They are sitting on a living room floor, surrounded by their toys.

SOLUTION: strengthener

PROBLEM: Premise: One guy skateboarding on a cement curb with his hands in the air.
Hypothesis: A guy is in a skating competition.
Update: The guy almost got hit by a passing car.

SOLUTION: weakener

PROBLEM: Premise: A young boy is swimming in an underground pool right next to the 3.5 ft. sign.
Hypothesis: A child is doing a backstroke in a pool.
Update: The child is moving forward in the water.

SOLUTION:
weakener