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#include <fstream>
using namespace std;
ifstream cin("consecutive.in");
ofstream cout("consecutive.out");
int v[1001],w[1001];
int main()
{
int n,m,t,s,r;
cin>>t;
while(t--)
{
r=0;
s=0;
cin>>n;
for(int i=1;i<=n/2;i++)
{
s=i;
for(int j=i+1;s<=n;j++)
{
s+=j;
if(s==n)
{
r++;
v[r]=i;
w[r]=j;
break;
}
}
}
cout<<r<<'\n';
while(r--)
cout<<v[r+1]<<' '<<w[r+1]<<'\n';
}
return 0;
}