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 j in range(10)] f = defaultdict(int) for i in range(n): z = len(s[i]) y = list(s[i]) for j in range(z): x = y.copy() x.pop(j) d[j]["".join(x)] += 1 for i in range(n): z = len(s[i]) y = list(s[i]) ans = 0 for j in range(z): x = y.copy() x.pop(j) ans += d[j]["".join(x)] print(ans-len(s[i]))