[USER (data scientist)]: For the CPU, a 6th generation Intel Core i5 or an equivalent AMD processor should suffice as the minimum requirement. Please generate a list of business laptop categories ('Notebook', 'Ultrabook', 'Workstation') and filter the dataframe 'laptops_price' to include only these categories, saving the list as a pickle file.
My template of code snippet is:

---BEGIN CODE TEMPLATE---

import pandas as pd
import pickle 

laptops_price = pd.read_csv("laptops_price.csv")

# YOUR SOLUTION BEGIN:
<code1>
[GENERATE YOUR CODE]
</code1>
# YOUR SOLUTION END:

print(filtered_laptops)

# save data
pickle.dump(filtered_laptops,open("./pred_result/filtered_laptops.pkl","wb"))

---END CODE TEMPLATE---

[YOU (AI assistant)]: Okay, let's filter the laptops based on that CPU requirement. 
