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

const int MAXN=1e3+5;
const int MAXM=1e3+5;

int n,m;
int a[MAXN][MAXM];

//1110
//1011
//1101
//0111

int main(){
	int t;cin>>t;
	while(t--){
		cin>>n>>m;
		int ans=n*m;
		if(max(n,m)<=3){
			for(int i=1;i<=n;i++){
				for(int j=1;j<=m;j++){
					a[i][j]=1;
				}
			}
		}else if(min(n,m)==3&&(max(m,n)-min(m,n))%4==0){
			if(n==3){
				for(int i=1;i<=n;i++){
					for(int j=1;j<=m;j++)
						if(i==1||i==3){
							if(j%4==0)a[i][j]=0,ans--;
							else a[i][j]=1;
						}else{
							if(j%4==2)a[i][j]=0,ans--;
							else a[i][j]=1;
						}
				}
			}else{
				for(int i=1;i<=n;i++){
					if(i%2==1)a[i][1]=a[i][2]=a[i][3]=1;
					else if(i%4==2)a[i][1]=a[i][3]=1,a[i][2]=0,ans--;
					else a[i][1]=a[i][3]=0,a[i][2]=1,ans-=2;
				}
			}
		}else{
			for(int i=1;i<=n;i++)
				for(int j=1;j<=m;j++){
					if(i%4==1){
						if(j%4==0)a[i][j]=0,ans--;
						else a[i][j]=1;
					}else if(i%4==2){
						if(j%4==2)a[i][j]=0,ans--;
						else a[i][j]=1;
					}else if(i%4==3){
						if(j%4==3)a[i][j]=0,ans--;
						else a[i][j]=1;
					}else{
						if(j%4==1)a[i][j]=0,ans--;
						else a[i][j]=1;
					}
				}
		
		}
		cout<<ans<<"\n";
		for(int i=1;i<=n;i++){
			for(int j=1;j<=m;j++){
				cout<<a[i][j];
			}
			cout<<"\n";
		}
	}
}