#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define fi first
#define se second
const int N=1e6+10;
void solved()
{
	ll n;cin>>n;
	if (n==1)
	{
		cout<<1<<"\n";cout<<1<<" "<<1<<"\n";
	}
	cout<<n+n-2<<"\n";
	for (int i=1;i<=n;i++) cout<<1<<" "<<i<<"\n";
	for (int j=2;j<=n-1;j++) cout<<n<<" "<<j<<"\n";
}
int main()
{
    ll t;cin>>t;
    while(t--) 
	solved();
    return 0;
}