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 racks PersonX's brain
Hypothesis: As a result, PersonX feels lethargic
Update: PersonX exerts a lot of mental energy.

SOLUTION: weakener

PROBLEM: Premise: PersonX drives to the gas station
Hypothesis: Before, PersonX needed to check the fuel level
Update: PersonX has a grocery list

SOLUTION: weakener

PROBLEM: Premise: PersonX gets some work done
Hypothesis: PersonX then completes a task
Update: PersonX will have to work more tomorrow

SOLUTION:
weakener