Identify Sources of Customer Complaints

For the assessment, you will be provided with a small collection of 10 fictitious synthetically generated emails from customers of a mega retail store called BuyBuy. Each of these emails involves a customer from a specified store location either praising or complaining about a specific product they recently bought.

**Your objective is to create a LangChain chain that when invoked with the emails, will respond concisely with what category of product is most associated with negative customer sentiment, and also, which store location has the most customer complaints.**