func_code_string: #include <bits/stdc++.h>   using namespace std;   const double pi = acos(0.0) * 2.0;   const double eps = 1e-12;   const int step[8][2] = {{1, 0}, {-1, 0}, {0, 1},  {0, -1},                           {1, 1}, {1, -1}, {-1, 1}, {-1, -1}};   template <class T>   inline T abs1(T a) {     return a < 0 ? -a : a;   }   template <class T>   inline T max1(T a, T b) {     return a > b ? a : b;   }   template <class T>   inline T max1(T a, T b, T c) {     return max1(max1(a, b), c);   }   template <class T>   inline T max1(T a, T b, T c, T d) {     return max1(max1(a, b, c), d);   }   template <class T>   inline T max1(T a, T b, T c, T d, T e) {     return max1(max1(a, b, c, d), e);   }   template <class T>   inline T min1(T a, T b) {     return a > b ? a : b;   }   template <class T>   inline T min1(T a, T b, T c) {     return min1(min1(a, b), c);   }   template <class T>   inline T min1(T a, T b, T c, T d) {     return min1(min1(a, b, c), d);   }   template <class T>   inline T min1(T a, T b, T c, T d, T e) {     return min1(min1(a, b, c, d), e);   }   template <class T>   inline T lowb(T num) {     return num & (-num);   }   inline int jud(double a, double b) {     if (abs(a) < eps && abs(b) < eps)       return 0;     else if (abs1(a - b) / abs1(a) < eps)       return 0;     if (a < b) return -1;     return 1;   }   template <typename t>   inline int jud(t a, t b) {     if (a < b) return -1;     if (a == b) return 0;     return 1;   }   template <typename it, typename t1>   inline int find(t1 val, it a, int na, bool f_small = 1, bool f_lb = 1) {     int be = 0, en = na - 1;     if (*a <= *(a + na - 1)) {       if (f_lb == 0)         while (be < en) {           int mid = (be + en + 1) / 2;           if (jud(*(a + mid), val) != 1)             be = mid;           else             en = mid - 1;         }       else         while (be < en) {           int mid = (be + en) / 2;           if (jud(*(a + mid), val) != -1)             en = mid;           else             be = mid + 1;         }       if (f_small && jud(*(a + be), val) == 1) be--;       if (!f_small && jud(*(a + be), val) == -1) be++;     } else {       if (f_lb)         while (be < en) {           int mid = (be + en + 1) / 2;           if (jud(*(a + mid), val) != -1)             be = mid;           else             en = mid - 1;         }       else         while (be < en) {           int mid = (be + en) / 2;           if (jud(*(a + mid), val) != 1)             en = mid;           else             be = mid + 1;         }       if (!f_small && jud(*(a + be), val) == -1) be--;       if (f_small && jud(*(a + be), val) == 1) be++;     }     return be;   }   inline int bitnum(unsigned int nValue) { return __builtin_popcount(nValue); }   inline int bitnum(int nValue) { return __builtin_popcount(nValue); }   inline int bitnum(unsigned long long nValue) {     return __builtin_popcount(nValue) + __builtin_popcount(nValue >> 32);   }   inline int bitnum(long long nValue) {     return __builtin_popcount(nValue) + __builtin_popcount(nValue >> 32);   }   inline int bitmaxl(unsigned int a) {     if (a) return 0;     return 32 - __builtin_clz(a);   }   inline int bitmaxl(int a) {     if (a) return 0;     return 32 - __builtin_clz(a);   }   inline int bitmaxl(unsigned long long a) {     int temp = a >> 32;     if (temp) return 32 - __builtin_clz(temp) + 32;     return bitmaxl(int(a));   }   inline int bitmaxl(long long a) {     int temp = a >> 32;     if (temp) return 32 - __builtin_clz(temp) + 32;     return bitmaxl(int(a));   }   long long pow(long long n, long long m, long long mod = 0) {     if (m < 0) return 0;     long long ans = 1;     long long k = n;     while (m) {       if (m & 1) {         ans *= k;         if (mod) ans %= mod;       }       k *= k;       if (mod) k %= mod;       m >>= 1;     }     return ans;   }   const int maxn = (1 << 24) + 10;   int cnt[maxn], n;   int arr[10010];   int main() {     ios_base::sync_with_stdio(0);     scanf( %d , &n);     for (int i = 0; i < n; i++) {       char str[10];       scanf( %s , str);       int rmask = 0;       for (int j = 0; j < 3; j++) rmask |= 1 << (str[j] -  a );       rmask = (1 << 24) - 1 - rmask;       arr[i] = rmask;       cnt[rmask]++;     }     long long ans = 0;     for (int i = 23; i >= 0; i--) {       int mask = 1 << 24;       mask -= 1 + (1 << i);       for (int j = mask; j >= 0; j = (j - 1) & mask) {         cnt[j] += cnt[j + (1 << i)];         if (j == 0) break;       }     }     for (int i = (1 << 24) - 1; i >= 0; i--) {       ans ^= (n - cnt[i]) * (n - cnt[i]);     }     cout << ans << endl;     return 0;   }   