<|im_start|>system
You are a helpful assistant. You first think about the reasoning process in the mind and then provide the user with the answer. You should try to truely solve the question by yourself without cheating.  <|im_end|>
<|im_start|>user
 If a rectangular prism's length is twice its width, the width is twice its height, and the sum of all its edge lengths is 56, what is the volume of this rectangular prism? Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>
user
64
If a rectangular prism's length is twice its width, the width is twice its height, and the sum of all its edge lengths is 56, what is the volume of this rectangular prism?
test