Instructions: In this task, you are given two sentences in Persian separated with <sep>, and you have to determine whether the sentences are paraphrases or not. Classify your answers into "paraphrase" and "not-paraphrase".
Input: مهندسی سخت چگونه پایدار است؟ <sep> چرا مهندسی سخت پایدار نیست؟
Output:
not-paraphrase