<|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
 A class is scheduling 5 lessons for Monday morning, including Chinese, Mathematics, English, Music, and Physical Education, each for one lesson. Considering the effectiveness of students' learning, Mathematics cannot be arranged for the first lesson, Chinese and English must be adjacent, and Music and Physical Education cannot be adjacent. Calculate the number of different scheduling methods. 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
20
A class is scheduling 5 lessons for Monday morning, including Chinese, Mathematics, English, Music, and Physical Education, each for one lesson. Considering the effectiveness of students' learning, Mathematics cannot be arranged for the first lesson, Chinese and English must be adjacent, and Music and Physical Education cannot be adjacent. Calculate the number of different scheduling methods.
test