#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
#define all(x) ((x).begin()), ((x).end())
#define pb push_back

const int N = 1511;
int a[N][N];
int n, m, k;
void print() {
    int sum = 0, x = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            printf("%d", a[i][j]);
            sum += a[i][j];
            if (i && j) {
                x += (a[i][j] + a[i - 1][j] + a[i][j - 1] + a[i - 1][j - 1] == 2);
            }
        }
        printf("\n");
    }
    assert(sum == k);
    assert(x == 0 || (n == 2 && m == 2 && k == 2));
}
void solve(int nn, int mm, int kk) {
    if (nn != -1) {
        n = nn;
        m = mm;
        k = kk;
    } else {
        scanf("%d%d%d", &n, &m, &k);
    }
    if (k == 2) {
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                a[i][j] = (i == 0 && j == 0 || i == n - 1 && j == m - 1);
            }
        }
        print();
        return;
    }
    if (k == n * m - 2) {
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                a[i][j] = !(i == 0 && j == 0 || i == n - 1 && j == m - 1);
            }
        }
        print();
        return;
    }
    bool rev = false;
    if (k > n * m / 2) {
        k = n * m - k;
        rev = true;
    }
    bool mir = false;
    if (n > m) {
        mir = true;
        swap(n, m);
    }
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            a[i][j] = 0;
        }
    }
    
    int cnt = 0;
    int len = 0;
    while(cnt < k) {
        len++;
        for (int i = 1; i <= min(len, n); i++) {
            a[i - 1][len - i] = 1;
        }
        cnt += min(len, n);
    }
    // printf("cnt =  %d\n", cnt);
    if (len >= n + 1) {
        for (int j = len - n - 1; j >= 0 && cnt > k; j -= 2) {
            cnt--;
            a[n - 1][j] = 0;
        }
    }
    for (int i = n - 1; i >= 1 && cnt > k + 1; i--) {
        for (int j = m - 1; j >= 0 && cnt > k + 1; j--) {
            if (a[i][j] == 1) {
                a[i][j] = 0;
                a[i - 1][j] = 0;
                cnt -= 2;
            }
        }
    }
    if (cnt > k) {
        a[0][0] = 0;
    }

    if (mir) {
        for (int i = 0; i < n; i++) {
            for (int j = i; j < m; j++) {
                swap(a[i][j], a[j][i]);
            }
        }
        swap(n, m);
    }
    if (rev) {
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                a[i][j] ^= 1;
            }
        }
        k = n * m - k;
    }

    print();
}
int main() {
    int t;
    scanf("%d", &t);
   for(int qq = 1; qq <= t; qq++) {
    // for (int i = 2; i <= 10; i++) {
    //     for(int j = 2; j <= 10; j++) {
    //         for(int k = 0; k <= i * j; k++) {
    //             printf("%d %d %d\n", i, j, k);
    //             solve(i, j, k);
    //         }
    //     }
    // }
        solve(-1, -1, -1);
   }
}