#백준 8892 팰린드롬 number = int(input()) save = [] for i in range(number): a= int(input()) palin = [] for j in range(a): b= input() palin.append(b) go = True for j in range(0,a): for k in range(0,a): if j==k: continue word = palin[j] + palin[k] reverse = word[::-1] if word == reverse: save.append(word) go = False break if go == False : break if go == True: save.append(0) for i in range(number):..