from collections import defaultdict
import itertools

N=int(input())
S=[input() for i in range(N)]
ans=0
dct=defaultdict(int)
for b in range(N):
    for c in range(b+1,N):
        T=[]
        cnt=0
        for i in range(4):
            T.append([])
            if S[b][i]==S[c][i]:
                T[-1].append(S[b][i])
            else:
                T[-1].append("*")
                T[-1].append(S[b][i])
                T[-1].append(S[c][i])
                cnt+=1
        for tpl in itertools.product(*[T[i] for i in range(4)]):
            ans+=dct["".join(tpl)]*(-1)**(cnt-tpl.count("*"))
    for tpl in itertools.product(*["*"+S[b][i] for i in range(4)]):
        dct["".join(tpl)]+=1
print(ans)