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 black and white dog is playing with a large brown cow.
Hypothesis: A dog is let loose on a farm and goes up to a cow wanting to play.
Update: The dog is excited and starts to pet the cow

SOLUTION: strengthener

PROBLEM: Premise: Girl wearing a hat and holding her bike talks to her friend.
Hypothesis: Girl holding her bike is talking to her friend with black hair.
Update: The girl's hair is dark.

SOLUTION: strengthener

PROBLEM: Premise: The people watch the batter.
Hypothesis: The people are at a baseball game.
Update: They are at the World Series.

SOLUTION:
strengthener