TASK DEFINITION: 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.
PROBLEM: Premise: man in yellow shirt with USA on it sits on chair next to door
Hypothesis: A man near the door is waiting for a friend.
Update: The man is watching the door for hoodlums.

SOLUTION: weakener

PROBLEM: Premise: A man in a yellow construction hat with a tool bag on his back, is drilling a wall labeled superior walls.
Hypothesis: A construction worker is building the walls to a house.
Update: The wall has windows in it.

SOLUTION: strengthener

PROBLEM: Premise: A young boy appears to be hammering metal on top of an anvil.
Hypothesis: A blacksmith is forging a sword.
Update: The boy is hammering the metal into a round shape.

SOLUTION:
weakener