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.
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Question: Premise: A man on a motorcycle is towing a bicyclist on his bicycle behind him.
Hypothesis: A man on a red motorcycle is towing a bicyclist on a blue bicycle.
Update: The bicyclist's black helmet matches the color of his bike.

Answer: weakener


Question: Premise: A brown dog running along a dirt road.
Hypothesis: A brown dog is outside
Update: The dog was amoungst the horses in a large trailer.

Answer: weakener


Question: Premise: A man in shorts and white socks, wearing a knee brace, is riding a skateboard.
Hypothesis: The man is injured.
Update: The knee is halfway healed from a recent mishap.

Answer:
strengthener