#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define eb emplace_back
//mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
#define mod 998244353
#define ll long long
#define inf 0x3f3f3f3f
#define INF 0x3f3f3f3f3f3f3f3f
inline int read()
{
	char ch=getchar(); int nega=1; while(!isdigit(ch)) {if(ch=='-') nega=-1; ch=getchar();}
	int ans=0; while(isdigit(ch)) {ans=ans*10+ch-48;ch=getchar();}
	if(nega==-1) return -ans;
	return ans;
}
void print(vector<int> x){for(int i=0;i<(int)x.size();i++) printf("%d%c",x[i]," \n"[i==(int)x.size()-1]);}
#define N 1005
int a[N][N],n,m;
int w[]={3,1,2,0};
void work()
{
	cin>>n>>m;
	if(n<4&&m<4)
	{
		for(int i=0;i<n;i++) for(int j=0;j<m;j++) a[i][j]=1;
	}
	else
	{
		for(int i=0;i<n;i++) for(int j=0;j<m;j++)
		{
			if(j%4==w[i%4]) a[i][j]=0;
			else a[i][j]=1;
		}
	}
	int sum=0;
	for(int i=0;i<n;i++) for(int j=0;j<m;j++) sum+=a[i][j];
	printf("%d\n",sum);
	for(int i=0;i<n;i++)
	{
		for(int j=0;j<m;j++) putchar(a[i][j]+'0');
		putchar('\n');
	}
}
signed main()
{
	int T=read(); while(T--) work();
	return 0;
}