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.
--------
Question: 男孩被这个谜语难住了。
他要求一个提示。

Answer: effect


Question: 锁开了。
我转开了锁里的钥匙。

Answer: cause


Question: 我把纸折起来。
纸有折痕了。

Answer:
effect