TASK DEFINITION: In this task, you are given a hypothesis and an update. The hypothesis sentence is a statement that speaks of a socially normative behavior. In other words, it is a generalizing statement about how we expect people to behave in society. The update provides additional contexts about the situation that might UNDERMINE or SUPPORT the generalization. An undermining context provides a situation that weakens the hypothesis. A supporting context provides a situation that strengthens the generalization. Your task is to output 'strengthener' or 'weakener' if the update supports or undermines the hypothesis, respectively
PROBLEM: Hypothesis: It is good to acknowledge when people change for the better.
Update: Acknowledging the change encourages them to keep improving.

SOLUTION: strengthener

PROBLEM: Hypothesis: You should be friendly to your neighbors.
Update: They have informed you that they are not very friendly.

SOLUTION: weakener

PROBLEM: Hypothesis: It's wrong to not tip someone.
Update: The service was extremely bad.

SOLUTION:
weakener