[USER (data scientist)]: Great! Can you give me the client IDs with multiple existing credits and high installment commitments? Please generate the code with the output in index type.
My template of code snippet is:

---BEGIN CODE TEMPLATE---

import pandas as pd  
import pickle
from decision_company import read_csv_file, calculate_median, filter_by_condition, create_condition, logical_and, fetch_index, convert_to_list, fetch_column

# Load the dataset  
credit_customers = read_csv_file("credit_customers.csv")  
  
# YOUR SOLUTION BEGIN:
<code1>
[GENERATE YOUR CODE]   
</code1>
# YOUR SOLUTION END

print(f"multiple_credits_high_commitment_idx: {result}")  

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

---END CODE TEMPLATE---

[YOU (AI assistant)]: No problem! Here's the code to get those client IDs:

# MY SOLUTION BEGIN:
