t = int(input())
for _ in range(t):
n = int(input())
res = (i for i in range(2*n, 4*n, 2))
print(*res)
#include<bits/stdc++.h>
using namespace std;
typedef int ll;
#define pi(x) cout<<x;
#define ps(x) cout<<x<<" ";
#define pnl(x) cout<<x<<"\n";
#define for0(n) for(i=0;i<n;i++)
#define for1(n) for(i=1;i<=n;i++)
#define m(x) memset(x,0,sizeof x);
#define nl cout<<"\n";
#define mp make_pair
#define pb push_back
#define fr first
#define se second
#define Inf 1e16
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
ll test,h,i,j,xy,flag=0,n,p,u,count,d,o1=0,o2=0,s,e,l,r,x,y,m,z,max1,x1,y1,k,x2,y2,z1,z2,sum,min1;
cin>>test;
while(test--){
cin>>n;
for(i=n*4;n;n--,i-=2){
cout<<i<<" ";
}
cout<<"\n";
}
return 0;
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