import pandas as pd

orders = pd.DataFrame(
    {
        "region": ["East", "East", "West", "West", "West", "North"],
        "order_id": [1001, 1002, 1003, 1004, 1005, 1006],
        "sales_usd": [1200, 750, 1430, 1020, 650, 500],
        "units": [12, 8, 14, 9, 5, 4],
    }
)