Cities Alice has visited

Alice travels a lot for work. On each trip she visits a single city and then returns home.

Someone recently asked her how many different cities she has visited for work. Alice kept a log of every trip, so the answer is in there. Count the cities she has visited at least once.

The first line contains the number of test cases $T$, a positive integer at most $50$.

The first line of each test case contains the number of work trips $n$ that Alice has taken so far, a positive integer at most $100$. The next $n$ lines describe those trips: the $i$-th of them contains the name of the city Alice visited on her $i$-th trip.

Alice's work only sends her to cities with simple names. A city name consists of lowercase letters only, has at least one letter, contains no spaces, and is at most $20$ characters long.

For each test case, print a single line with the number of distinct cities Alice has visited on her work trips.