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.

[Q]: Premise: Children climbing an old tree in front of a brick building.
Hypothesis: Children are climbing an old tree in front of the school.
Update: The library in the area has been around for many years.
[A]: strengthener


[Q]: Premise: A man wearing sunglasses, a cap, and a blue shirt with a Superman logo on it is walking on the sidewalk holding a stereo.
Hypothesis: The stereo that the man is holding is large.
Update: Some onlookers ask him 'You need help with that?'
[A]: strengthener


[Q]: Premise: Two people have their heads down on a table while a man in a brown jacket looks out the window at a group of bikes and motorcycles.
Hypothesis: A man looks out the window to check on his bike.
Update: The man looks out the window to see if his friend is outside.
[A]:
weakener