def ta_input():
    antall_tester = int(input()) #T

    for i in range(antall_tester):
        byer = [] # alle byer

        antall_byer = int(input()) #n
        for k in range(antall_byer):
            byer.append(input())

        unike_byer = set(byer)

        antall_unike_byer = len(unike_byer)

        print(antall_unike_byer)

ta_input()