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.

The inside of the train went dark.
The train travelled through a tunnel.
cause

The man wanted to get revenge on his enemy.
The man framed his enemy for a crime.
effect

The man fell unconscious.
The assailant struck the man in the head.

cause