import sys input = sys.stdin.readline N=int(input()) S=[input().strip() for _ in range(N)] from collections import defaultdict cnt=defaultdict(int) for s in S: for i in range(len(s)): a = s[0:i]+"*"+s[i+1:] cnt[a]+=1 for s in S: ans=0 for i in range(len(s)): a = s[0:i]+"*"+s[i+1:] ans += cnt[a]-1 print(ans)