TASK DEFINITION: In this task your given two statements in Chinese. 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: 我感到筋疲力尽。
我很早就上床睡觉了。

SOLUTION: effect

PROBLEM: 船失事了。
船员们淹死了。

SOLUTION: effect

PROBLEM: 这棵树落叶了。
叶子堆积在地面上。

SOLUTION:
effect