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Sure! Based on the image and the questions:

1. Why are sandwich bars so popular?
Sandwich bars are popular because they offer quick, convenient, and affordable meals that can be eaten on the go. They usually have a variety of options, making it easy for customers to find something they like. Additionally, sandwiches are versatile, portable, and suitable for different tastes and dietary preferences, which enhances their appeal.

2. What can you buy there?
At a sandwich bar, you can buy a variety of sandwiches, and potentially other related items such as snacks, drinks, salads, or desserts, depending on the specific offerings of the establishment.

Let me know if you'd like more detailed explanations or help with other questions!