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.

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.
strengthener

Premise: Two girls are standing behind another girl.
Hypothesis: Two girls are preparing to push a third girl.
Update: the third girl is on the top stair
weakener

Premise: a kid is trying to climb a big rock.
Hypothesis: A child at a national park tries to climb up a boulder.
Update: There is a park ranger watching nearby.

strengthener