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: The cyclist is airborne on his bike as it makes a jump between two mounds of earth.
Hypothesis: A biker is making a sick jump on his expensive green bicycle over two ramps of earth.
Update: The professional BMX performer had been delighting proud all afternoon.

SOLUTION: strengthener

PROBLEM: Premise: A bright wall painting on the street.
Hypothesis: A mural of a sunset.
Update: An onlooker remarks 'Lovely, reminds me of nights in Daytona'

SOLUTION: strengthener

PROBLEM: Premise: The man is carefully shaving off his facial hair.
Hypothesis: A man is getting ready to go to work by grooming himself.
Update: Shaving cream and car keys are seen next to the man.

SOLUTION:
strengthener