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: cnt[Si] += 1 for Si in S: ans = 0 for i in range(len(Si)): for j in range(26): if ord(Si[i])-ord('a')==j: continue T = list(Si) T[i] = chr(j+ord('a')) ans += cnt[''.join(T)] print(ans)