#include<bits/stdc++.h>
using namespace std;

int t, n, m, a[100010];
int ans[2010][2010];

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);
	for (int i = 1; i <= 1000;i++){
		ans[0][i] = i;
	}
	int p = 1;
	for (int i = 0; i < 512; i+=p/2){
		for (int j = 1; j <= p; j++){
			for (int k = 0; k < 512; k += p * 2){
				for (int l = 1; l <= p; l++){
					ans[i + j][k + l] = ans[i + j - p][k + l + p];
					ans[i + j][k + l + p] = ans[i + j - p][k + l];
				}
			}
		}
		p <<= 1;
	}
	cin >> t;
	while(t--){
		cin >> n >> m;
        if (n==1 || m>=n){
            cout << "Impossible\n";
            continue;
        }
		int k = n, mi = 1;
		while(k%2==0){
			k /= 2;
			mi*=2;
		}
		mi -= 1;
		if (m>mi){
			cout << "Impossible\n";
			continue;
		}
		for (int i = 1; i <= m; i++){
			for (int j = 1; j <= n; j++){
				cout << ans[i][j] << ' ';
			}
			cout << '\n';
		}
	}
}