Instructions: In this task your given two statements in Vietnamese. 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.
Input: Sách rơi ra khỏi tủ sách.
Một trận động đất làm rung chuyển tủ sách.
Output:
cause