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. It makes you much less likely to believe the hypothesis is true. A strengthener is a statement that strengthens the hypothesis. It makes you much more likely to believe the hypothesis is true. Your task is to output 'strengthener' or 'weakener' if the update strengths or weakens the hypothesis, respectively.
PROBLEM: Premise: PersonX tracks PersonY
Hypothesis: Before, PersonX needed find out PersonY's habits.
Update: X hired a PI.

SOLUTION: strengthener

PROBLEM: Premise: PersonX fixes PersonY's flat tire
Hypothesis: Before, PersonX needed a jockey
Update: PersonX owns a garage

SOLUTION: strengthener

PROBLEM: Premise: PersonX throws water
Hypothesis: PersonX then throws more
Update: PersonX started a water fight.

SOLUTION:
strengthener