There are 16 cities participating in a football match. Each city has two teams: Team A and Team B. According to the rules, each team can compete with any other team from different cities at most once. After a few days, it is observed that the number of matches played by each team, except for Team A from City 1, is unique. Determine the number of matches that Team A from City 1 has played.

Let's think step by step and output the final answer within \boxed{}.
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