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.

Premise: An Asian man performing on a stage.
Hypothesis: A man singing.
Update: The man performs an opera aria.
strengthener

Premise: A cat is watching a girl construct a Lego airplane.
Hypothesis: A cat is watching a girl build a airplane and throw it across the room
Update: The plane is only half finished
weakener

Premise: A chef is cooking some food for a man in a green shirt.
Hypothesis: A man is making hamburgers for a friend.
Update: The chef specializes in gourmet burgers.

strengthener