instruction:
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.
question:
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.
answer:
strengthener


question:
Premise: Young punk rock guitarist, wearing a red lined jacket with a badge, is in front of foggy blue and purple lighting.
Hypothesis: The new popular guitarist stands in front of lighting at his new show
Update: The guitarist is nervous
answer:
strengthener


question:
Premise: They are walking around the mountain.
Hypothesis: They are enjoying themselves outdoors.
Update: Many of the people are taking pictures of the scenery and talking and laughing with each other.
answer:

strengthener