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 dog barked.
A knock sounded at the door.

SOLUTION: cause

PROBLEM: The fish bit the line.
The fisherman reeled in the fish.

SOLUTION: effect

PROBLEM: The man uncovered incriminating evidence against his enemy.
The man blackmailed his enemy.

SOLUTION:
effect