#include<bits/stdc++.h>
#define fr(i,j,k) for(register int i=j;i<=k;++i)
#define rf(i,j,k) for(register int i=j;i>=k;--i)
#define foredge(i,j) for(register int i=head[j];i;i=e[i].nxt)
#define pb push_back
#define Times printf("Time:%.3lf\n",clock()/CLOCKS_PER_SEC)
using namespace std;
inline int read(){
	int x=0;
	bool f=0;
	char c=getchar();
	while(!isdigit(c)) f|=(c=='-'),c=getchar();
	while(isdigit(c)) x=(x<<3)+(x<<1)+(c^48),c=getchar();
	return f?-x:x;
}
inline void write(int x){
    if(x<0){putchar('-');x=-x;}
    if(x>9)write(x/10);
    putchar(x%10+'0');
}
inline void writeln(int x){write(x); puts("");}
inline void writepl(int x){write(x); putchar(' ');}
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
inline int randfind(int l,int r){return rnd()%(r-l+1)+l;}
//inline void init(){
//	int t=read();
//	while(t--) work();
//}
const int Maxn=1e7+10;
int n;
int id[Maxn],ln[Maxn];
inline bool cmp(int a,int b){return ln[a]<ln[b];}
string s[Maxn];
#define ull unsigned long long
map<ull,int> mp;
const int base=19260817;
ull hsh[Maxn];
int kmp[Maxn];
char c[Maxn];
long long ans;
inline void getans(int ln){
    fr(i,1,ln) hsh[i]=hsh[i-1]*base+(c[i]-'a'+1);
    // fr(i,1,ln) cout<<c[i]<<' ';cout<<endl;
    kmp[0]=kmp[1]=0;
    int now=0;
    fr(i,2,ln){
        while(now && c[now+1]!=c[i]) now=kmp[now];
        if(c[now+1]==c[i]) ++now;
        kmp[i]=now;
    }
    now=ln;
    while(now){
        // cout<<ans<<' '<<now<<endl;
        ans+=mp[hsh[now]];
        now=kmp[now];
    }
    mp[hsh[ln]]++;
}
inline void work(){
    mp.clear();
    fr(i,1,n) cin>>s[i],ln[i]=s[i].size(),id[i]=i;
    sort(id+1,id+n+1,cmp);
    fr(i,1,n){
        // cout<<"*"<<id[i]<<endl;
        int num=id[i],len=s[num].size();
        fr(j,1,len) c[j]=s[num][j-1];
        getans(len);
    }
    printf("%lld\n",ans);ans=0;
}
inline void init(){
    while(cin>>n) work();
}
signed main(){
	// freopen("input.in","r",stdin);
	// freopen("output.out","w",stdout);
    init();
    // printf("\nTIME:%.3lf",(double)clock()/CLOCKS_PER_SEC);
	return 0;
}