#include<bits/stdc++.h> 
#define int long long 
#define x first 
#define y second 
#define il inline 
#define em emplace 
#define eb emplace_back 
#define debug() puts("-----") 
using namespace std; 
typedef pair<int,int> pii; 
il int read(){ 
	int x=0,f=1; char ch=getchar(); 
	while(ch<'0'||ch>'9'){ if(ch=='-') f=-1; ch=getchar(); } 
	while(ch>='0'&&ch<='9') x=(x<<1)+(x<<3)+(ch^48),ch=getchar(); 
	return x*f; 
} 
il void solve(){ 
	int n=read(),m=read(); 
	cout<<"Yes"<<endl; 
	for(int i=1;i<=n;i++){ 
		for(int j=1;j<=i;j++){ 
			cout<<1; 
		} cout<<endl; 
	} 
} 
signed main(){ 
	int T=read(); 
	while(T--) solve(); 
	return 0; 
}