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: 电梯门开了。
电梯到达指定的楼层。

SOLUTION: cause

PROBLEM: 市民们把国旗挂在家门外。
这个国家正在纪念它的独立。

SOLUTION: cause

PROBLEM: 侦探们在犯罪现场撒了粉来显示指纹。
他们发现了凶手的身份。

SOLUTION:
effect