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: 天开始下雨了。
司机打开了大前灯。

SOLUTION: effect

PROBLEM: 我仔细考虑了这个问题。
我想出了一个解决办法。

SOLUTION: effect

PROBLEM: 我感到筋疲力尽。
我学习了一整天。

SOLUTION:
cause