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 looks back at PersonY
Hypothesis: As a result, PersonX feels curious
Update: PersonY gives PersonX a wave.

SOLUTION: weakener

PROBLEM: Premise: PersonX introduces PersonY
Hypothesis: Before, PersonX needed to know PersonY's name
Update: PersonX is introducing PersonY from memory.

SOLUTION: strengthener

PROBLEM: Premise: PersonX joins PersonY's party
Hypothesis: PersonX then shunned by old party
Update: PersonX crossed the aisle

SOLUTION:
strengthener