func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 1 << 24;   int n, f[MAXN], Tohka;   bool p[MAXN];   int lowbit(int first) { return first & -first; }   int main() {     cin >> n;     char str[4];     for (int i = 1; i <= n; ++i) {       scanf( %s , str);       int s = 0;       for (int j = 0; j < 3; ++j) s |= 1 << (str[j] -  a );       ++f[s];     }     for (int i = 0; i < 24; ++i)       for (int j = 1; j < MAXN; ++j)         if (!(j & (1 << i))) f[j] += f[j + (1 << i)];     p[0] = 0;     for (int i = 1; i < MAXN; ++i)       p[i] = p[i - lowbit(i)] ^ 1, f[i] *= (p[i]) ? 1 : -1;     for (int i = 0; i < 24; ++i)       for (int j = MAXN - 1; j >= 0; --j)         if (j & (1 << i)) f[j] += f[j - (1 << i)];     for (int i = 0; i < MAXN; ++i) Tohka ^= f[i] * f[i];     cout << Tohka << endl;     fclose(stdin);     fclose(stdout);     return 0;   }   