TASK DEFINITION: In this task your given two statements. You must judge whether the second sentence is the cause or effect of the first one. Label the instances as "cause" or "effect" based on your judgment. The sentences are separated by a newline character.
PROBLEM: The boy's back ached.
His backpack was heavy.

SOLUTION: cause

PROBLEM: The boy kicked the vending machine.
The bag of chips was stuck.

SOLUTION: cause

PROBLEM: The cook's eyes watered.
He cut an onion.

SOLUTION:
cause