#include<bits/stdc++.h>
using namespace std;
namespace my_std{
	#define ll long long
	#define bl bool
	ll my_pow(ll a,ll b,ll mod){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res=(res*a)%mod;
			a=(a*a)%mod;
			b>>=1;
		}
		return res;
	}
	ll qpow(ll a,ll b){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res*=a;
			a*=a;
			b>>=1;
		}
		return res;
	}
	#define db double
	#define pf printf
	#define pc putchar
	#define fr(i,x,y) for(register ll i=(x);i<=(y);i++)
	#define pfr(i,x,y) for(register ll i=(x);i>=(y);i--)
	#define go(u) for(ll i=head[u];i;i=e[i].nxt)
	#define enter pc('\n')
	#define space pc(' ')
	#define fir first
	#define sec second
	#define MP make_pair
	#define il inline
	#define inf 8e18
	#define random(x) rand()*rand()%(x)
	#define inv(a,mod) my_pow((a),(mod-2),(mod))
	il ll read(){
		ll sum=0,f=1;
		char ch=0;
		while(!isdigit(ch)){
			if(ch=='-') f=-1;
			ch=getchar();
		}
		while(isdigit(ch)){
			sum=sum*10+(ch^48);
			ch=getchar();
		}
		return sum*f;
	}
	il void write(ll x){
		if(x<0){
			x=-x;
			pc('-');
		}
		if(x>9) write(x/10);
		pc(x%10+'0');
	}
	il void writeln(ll x){
		write(x);
		enter;
	}
	il void writesp(ll x){
		write(x);
		space;
	}
}
using namespace my_std;
ll t,n,m,a[1010][1010];
int main(){
	t=read();
	while(t--){
		bl rev=0;
		n=read();
		m=read();
		if(n>m){
			swap(n,m);
			rev=1;
		}
		fr(i,1,n) fr(j,1,m) a[i][j]=1;
		if(m>3){
			ll maxx=1,res=0;
			fr(_,1,4){
				ll now=_,sum=n*m;
				fr(i,1,n){
					sum-=(m-now)/4+1;
					now=now%4+1;
				}
				if(res<sum){
					res=sum;
					maxx=_;
				}
			}
			ll now=maxx;
			fr(i,1,n){
				for(ll j=now;j<=m;j+=4) a[i][j]=0;
				now=now%4+1;
			}
		}
		ll ans=0;
		fr(i,1,n) fr(j,1,m) ans+=a[i][j];
		writeln(ans);
		if(rev){
			fr(j,1,m){
				fr(i,1,n) write(a[i][j]);
				enter;
			}
		}
		else{
			fr(i,1,n){
				fr(j,1,m) write(a[i][j]);
				enter;
			}
		}
	}
}