func_code_string: #include <bits/stdc++.h>   using namespace std;   long long power(long long a, long long b) {     if (b == 0) return 1;     if (b == 1) return a;     if (b % 2 == 1) return (power(a, b - 1) * a);     long long q = power(a, b / 2);     return (q * q);   }   void solve() {     long long n;     cin >> n;     for (long long i = 0; i < n; i++) {       for (long long j = 0; j < n; j++) {         if (i == j or i == j + 1 or i == j - 1)           cout << 1 <<    ;         else           cout << 0 <<    ;       }       cout << endl;     }   }   int32_t main() {     ios_base::sync_with_stdio(false);     cout.tie(NULL);     cin.tie(NULL);     long long t = 1;     cin >> t;     while (t--) {       solve();     }     return 0;   }   