#include<bits/stdc++.h>
typedef long long ll;
#define pb push_back
#define fr first
#define sc second
using namespace std;
int main(){
ios_base::sync_with_stdio(false);cin.tie(NULL);
int t;cin>>t;
while(t--){
int n,m;cin>>n>>m;
int k=1;
if(n>m){
k=-1;
swap(n,m);
}
if(m%n==0){
cout<<m-1<<endl;
for(int i=1;i<m;i++){
cout<<-k<<" ";
}
cout<<endl;
continue;
}
int x=1e9/(n-1)-1;
int l=(m/n+1)*n-1;
if(m+(m%n)-1>l){
x=(1e9-1)/(n-1);
l=m+(m%n)-1;
cout<<l<<endl;
for(int i=0;i<l;i++){
if((i%n)==(m%n)-1){
cout<<(x*(n-1)-1)*(k)<<" ";
}
else cout<<x*(-k)<<" ";
}
cout<<endl;
continue;
}
cout<<l<<endl;
for(int i=0;i<l;i++){
if(((i+1)%n)){
cout<<x*k<<" ";
}
else{
cout<<(x*(n-1)+1)*(-k)<<" ";
}
}
cout<<endl;
}
}
