import sys input = sys.stdin.readline from collections import * N = int(input()) S = [input()[:-1] for _ in range(N)] cnt = defaultdict(int) for Si in S: for i in range(len(Si)): T = list(Si) T[i] = '.' cnt[''.join(T)] += 1 for Si in S: ans = 0 for i in range(len(Si)): T = list(Si) T[i] = '.' ans += cnt[''.join(T)]-1 print(ans)