#include <bits/stdc++.h>
#define pb push_back
#define spc << " " <<
#define endl "\n"
#define all(x) x.begin(), x.end()
#define int long long
#define ii pair<long long,int>
#define vi vector<int>
#define vii vector<ii>
#define st first
#define nd second
#define mid (l+r)/2
#define inf 1e15
#define MOD 998244353
#define MX 100000
using namespace std;
void solve(){
int n,m; cin >> n >> m;//assuming m is bigger
int modi=1;
if(n>m){
modi=-1;
swap(n,m);
}
if(n==m || m-1>=2*n-1){
cout << m-1 << endl;
if(m-1==0) return;
for(int i=1; i<=m-1; i++){
cout << -modi << " ";
}
cout << endl;
}
else{
cout << 2*n-1 << endl;
if(2*n-1==0) return;
for(int i=1; i<=2*n-1; i++){
if(i==n) cout << -modi*2*(n-1)-modi << " ";
else cout << 2*modi << " ";
}
cout << endl;
}
}
signed main(){
ios_base::sync_with_stdio(false);cin.tie(0);
#ifdef Local
freopen("in","r",stdin);
freopen("out","w",stdout);
/*#else
freopen("248.in","r",stdin);
freopen("248.out","w",stdout);*/
#endif
int t=1;
cin >> t;
while(t--) solve();
}
