#include<bits/stdc++.h>
using namespace std;
#define ll long long int 

int main()
{
   ll tc;
    cin>>tc;
    while(tc--)
    {
        ll n;
        cin>>n;
        if(n==1)
            cout<<1<<endl;
        else if(n==2)
            cout<<2<<' '<<1<<endl;
        else if(n==3)
            cout<<2<<" "<<3<<" "<<1<<endl;
        else
        {
            vector<ll>o,e;
            for(int i=2;i<=n;i+=2)
                e.push_back(i);
            for(int i=1;i<=n;i+=2)
                o.push_back(i);
            if(n%2==0)
            {
                for(int i=0;i<n/2;i++)
                    cout<<e[i]<<" "<<o[i]<<" ";
                cout<<endl;
            }
            else
            {
                for(int i=0;i<e.size()-1;i++)
                    cout<<e[i]<<' '<<o[i]<<" ";
                cout<<e[e.size()-1]<<" "<<o[o.size()-1]<<" "<<o[o.size()-2]<<endl;
            }
        }
    }
    
    
}