# Arup Guha
# 7/19/2013
# Solution to 2013 SI@UCF Practice Programming Contest Problem: Free Pizza

def main():

    myFile = open("pizza.in", "r")
    numCases = int(myFile.readline())

    # Process each case.
    for loop in range(1, numCases+1):

        weeks = int(myFile.readline())
        people = []

        # Go through each week
        for i in range(weeks):

            size = int(myFile.readline())

            # Go through each attendee.
            for j in range(size):
                name = myFile.readline().split()[0]

                # Only add them if they are not there.
                if  not (name in people):
                    people.append(name)

        # Sort in alpha order.
        people.sort()

        # Output list in order.
        print("Semester ",loop,":", sep="")
        for i in range(len(people)):
            print(people[i])
        print()
            
    myFile.close()

main()