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: A man is wearing a green shirt and a welders mask.
Hypothesis: A man is hiding his identity.
Update: He stops every few yards, lifts the face piece while looking all around then returns it and goes a few more yards.

A: strengthener
****
Q: Premise: Two men play basketball.
Hypothesis: Two men are competing for the last spot on the basketball team.
Update: Two men are competing to become the final teammate on the basketball team this season.

A: strengthener
****
Q: Premise: Line of taxis waiting for passengers.
Hypothesis: Taxis wait for passengers at the airport.
Update: The busy holiday weekend will have several people flying in to town.

A:
strengthener
****