import sys input = lambda :sys.stdin.readline()[:-1] ni = lambda :int(input()) na = lambda :list(map(int,input().split())) yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES") no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO") ####################################################################### n = ni() s = [input() for i in range(n)] from collections import defaultdict d = defaultdict(int) for i in range(n): d[s[i]] += 1 for i in range(n): z = list(s[i]) ans = 0 for j in range(len(s[i])): for k in range(26): if ord(z[j])-97!=k: x = z[j] z[j] = chr(97+k) ans += d["".join(z)] z[j] = x print(ans)