#pragma GCC optimize ("Ofast")
#include<bits/stdc++.h>
using namespace std;
void *wmem;
char memarr[96000000];
inline int my_getchar_unlocked(){
  static char buf[1048576];
  static int s = 1048576;
  static int e = 1048576;
  if(s == e && e == 1048576){
    e = fread_unlocked(buf, 1, 1048576, stdin);
    s = 0;
  }
  if(s == e){
    return EOF;
  }
  return buf[s++];
}
inline void rd(int &x){
  int k;
  int m=0;
  x=0;
  for(;;){
    k = my_getchar_unlocked();
    if(k=='-'){
      m=1;
      break;
    }
    if('0'<=k&&k<='9'){
      x=k-'0';
      break;
    }
  }
  for(;;){
    k = my_getchar_unlocked();
    if(k<'0'||k>'9'){
      break;
    }
    x=x*10+k-'0';
  }
  if(m){
    x=-x;
  }
}
inline int rd(char c[]){
  int i;
  int sz = 0;
  for(;;){
    i = my_getchar_unlocked();
    if(i!=' '&&i!='\n'&&i!='\r'&&i!='\t'&&i!=EOF){
      break;
    }
  }
  c[sz++] = i;
  for(;;){
    i = my_getchar_unlocked();
    if(i==' '||i=='\n'||i=='\r'||i=='\t'||i==EOF){
      break;
    }
    c[sz++] = i;
  }
  c[sz]='\0';
  return sz;
}
inline void rd(string &x){
  char *buf = (char *)wmem;
  rd(buf);
  x = buf;
}
struct MY_WRITER{
  char buf[1048576];
  int s;
  int e;
  MY_WRITER(){
    s = 0;
    e = 1048576;
  }
  ~MY_WRITER(){
    if(s){
      fwrite_unlocked(buf, 1, s, stdout);
    }
  }
}
;
MY_WRITER MY_WRITER_VAR;
void my_putchar_unlocked(int a){
  if(MY_WRITER_VAR.s == MY_WRITER_VAR.e){
    fwrite_unlocked(MY_WRITER_VAR.buf, 1, MY_WRITER_VAR.s, stdout);
    MY_WRITER_VAR.s = 0;
  }
  MY_WRITER_VAR.buf[MY_WRITER_VAR.s++] = a;
}
inline void wt_L(char a){
  my_putchar_unlocked(a);
}
inline void wt_L(long long x){
  int s=0;
  int m=0;
  char f[20];
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    my_putchar_unlocked('-');
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
int N;
string S[200000];
int sz;
int lens[200000];
set<string> mp[1000000+1];
int cnt[26];
int main(){
  wmem = memarr;
  int i;
  int j;
  int k;
  int x;
  int z;
  long long res = 0;
  string tmp;
  rd(N);
  {
    int Lj4PdHRW;
    for(Lj4PdHRW=(0);Lj4PdHRW<(N);Lj4PdHRW++){
      rd(S[Lj4PdHRW]);
    }
  }
  for(i=(0);i<(N);i++){
    reverse(S[i].begin(), S[i].end());
  }
  for(i=(0);i<(N);i++){
    mp[S[i].size()].insert(S[i]);
  }
  for(i=(0);i<(1000000+1);i++){
    if(mp[i].size()){
      lens[sz++] = i;
    }
  }
  for(i=(0);i<(N);i++){
    int V9aVTaxx;
    z = S[i].size();
    x = 0;
    for(k=(0);k<(26);k++){
      cnt[k] = 0;
    }
    for(j=(0);j<(z);j++){
      cnt[S[i][j]-'a']++;
    }
    tmp = "";
    for(V9aVTaxx=(0);V9aVTaxx<(sz);V9aVTaxx++){
      auto &j = lens[V9aVTaxx];
      if(j >= S[i].size()){
        break;
      }
      while(x < j-1){
        tmp += S[i][x];
        cnt[S[i][x]-'a']--;
        x++;
      }
      for(k=(0);k<(26);k++){
        if(cnt[k]){
          res += mp[j].count(tmp+(char)('a'+k));
        }
      }
    }
  }
  wt_L(res);
  wt_L('\n');
  return 0;
}
// cLay varsion 20200509-1

// --- original code ---
// int N;
// string S[2d5];
// int sz, lens[2d5];
// set<string> mp[1d6+1];
// int cnt[26];
// {
//   int i, j, k, x, z;
//   ll res = 0;
//   string tmp;
// 
//   rd(N,S(N));
//   rep(i,N) reverse(S[i].begin(), S[i].end());
//   rep(i,N) mp[S[i].size()].insert(S[i]);
// 
//   rep(i,1d6+1) if(mp[i].size()) lens[sz++] = i;
//   rep(i,N){
//     z = S[i].size();
//     x = 0;
//     rep(k,26) cnt[k] = 0;
//     rep(j,z) cnt[S[i][j]-'a']++;
//     tmp = "";
//     rep[lens](j,sz){
//       if(j >= S[i].size()) break;
//       while(x < j-1){
//         tmp += S[i][x];
//         cnt[S[i][x]-'a']--;
//         x++;
//       }
//       rep(k,26) if(cnt[k]) res += mp[j].count(tmp+(char)('a'+k));
//     }
//   }
// 
//   wt(res);
// }


Measured memory_bytes: 73384