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How to order food
Find a seat.
It's probably a better idea to find a seat before you get your food. This is because if all the seats are full after you've collected your food, you're going to have to either eat standing up or walk around looking for a seat for quite some time.
Also, some restaurants send waiters to your table, so it's required that you find a seat. At some restaurants, there will be a hostess who will direct you to your seat.