#include <iostream>
#include <vector>
#include <string>
#include <stack>
#include <algorithm>
#include <bitset>
#include <math.h>
#include <queue>
#include <map>
#include <set>
#include <limits.h>
#include <limits>
#include <stdio.h>
#include <stdlib.h>
#include <cstring>
#include <sstream>
#include <string.h>
using namespace std;
int n, amp, freq;
string s;
string print(int M) {
    string a = "";
    for(int i = 1; i <= M; i++){
        for(int j = 1; j <= i; j++)
            a += (char)(i + '0');
        a += '\n';
    }
    for(int i = M - 1; i >= 1; i--){
        for(int j = 1; j <= i; j++)
            a += (char)(i + '0');
        a += '\n';
    }
    return a;
}
int main(){
    scanf("%d", &n);
    while (n-- && scanf("%d %d", &freq, &amp)){
        s = print(amp);
        while(freq--){
            cout << s;
            if (freq != 0 || n != 0)
                cout << endl;
        }
    }
}