#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define sz size()
#define ff first
#define ss second
#define pb push_back
#define pii pair <int, int>
#define dur exit(0)
#define dur1 return(0)
const int N = 2e5 + 5;
int jog[N];
int main () {
// freopen ("input.txt", "r", stdin);
ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int t;
cin >> t;
while ( t-- ) {
int n, m;
cin >> n >> m;
if (n % m == 0 or m % n == 0) {
int x = (n > m ? 1 : -1);
cout << max (n, m) - 1 << "\n";
for (int i = 1; i <= max (n, m) - 1; ++i) {
cout << x << " ";
}
cout << "\n";
}
else if (n > m) {
int x1 = -n;
int x2 = (m - 1) * n + 1;
int git = n;
while ((git + 1) % m != 0) {
git++;
}
cout << git << "\n";
for (int i = 1; i <= git; ++i) {
if (i % m == 0) cout << x2 << " ";
else cout << x1 << " ";
}
cout << "\n";
}
else {
int x1 = m;
int x2 = (n - 1) * m + 1;
x2 *= (-1);
int git = m;
while ((git + 1) % n != 0) {
git++;
}
cout << git << "\n";
for (int i = 1; i <= git; ++i) {
if (i % n == 0) cout << x2 << " ";
else cout << x1 << " ";
}
cout << "\n";
}
}
}
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