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 flying machine with a yellow sail is landing with industrial buildings in the background.
Hypothesis: The machine is not gas-operated.
Update: The machine has a battery.

SOLUTION: strengthener

PROBLEM: Premise: People wait in chairs, one person has their shoe off.
Hypothesis: THe people are waiting to be called for their flight.
Update: They are at the doctor's office.

SOLUTION: weakener

PROBLEM: Premise: Two Indian children in formal costume happily performing a ritual dance.
Hypothesis: The children are wearing blue shirts.
Update: The children are girls in traditional dress.

SOLUTION:
weakener