/*
ID: agageld1
LANG: C++17
TASK:
*/
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define N 400005
#define ff first
#define ss second
#define pb push_back
#define sz(s) (int)s.size()
#define rep(c, a, b) for(c = a; c <= b; c++)
ll n, t, T, a[N], m;
int main () {
ios::sync_with_stdio(0);cin.tie(0);
cin >> T;
while(T--) {
cin >> n >> m;
if(n == 1 && m == 1) {
cout << "0\n";
continue;
}
if(n%m == 0 || m%n == 0) {
t = 1;
if(m % n == 0) t = -1;
cout << max(n,m) - 1<< '\n';
for(int i = 1; i <= max(n,m) - 1; i++) {
cout << t << ' ';
}
cout << '\n';
continue;
}
if(n == 2) {
cout << m << '\n';
for(int i = 1; i < m; i += 2) {
cout << m - 1 << " " << (-1) * m << ' ';
}
cout << m - 1 << '\n';
}
else {
cout << n << '\n';
for(int i = 1; i < n; i+=2) {
cout << (n-1) * (-1) << " " << n << ' ';
}
cout << (n-1)* (-1) << '\n';
}
}
}
