for _ in range(int(input())):
n=int(input())
arr=list(map(int,input().split()))
arr.sort()
num=arr[0]
cnt=0
for i in range(1,n):
cnt+=1
ar=[]
ar.append(arr[i])
ar.append(num)
if cnt>n//2:
break
print(*ar) #include <vector>
#include <iostream>
#include <map>
#include <math.h>
#include <algorithm>
#include <string>
#include <iomanip>
#include <stack>
#define ll long long
using namespace std;
template<typename _Tp>
istream& operator >> (istream& i, vector<_Tp>& v){
for(_Tp& x : v)
i >> x;
return i;
}
long long roundup(long long a, long long b){
if(a%b == 0){
return a/b;
}
else return (a/b)+1;
}
int oproundup(int a, int b){
if(a%b == 0){
return (a/b)+1;
}
else return (a/b)+1;
}
bool isprime(ll n){ //QUICKEST WAY TO DETERMINE IF A NUMBER IS PRIME OR NOT
if(n == 2){
return true;
}
if(n == 1){
return false;
}
for(ll i = 2; i < sqrt(n)+1; i++){
if(n%i==0) return false;
}
return true;
}
long long gcd(long long int a, long long int b)
{
if (b == 0)
return a;
return gcd(b, a % b);
}
// Function to return LCM of two numbers
long long lcm(long long a, long long b)
{
return (a / gcd(a, b)) * b;
}
int addallup(double n){
return (roundup(n,2)*(2 + (n - 1)));
}
void output(bool t){
if(t == false){
cout << "NO";
}
else cout << "YES";
}
map<char,int> mp;
map<int,map<char,int>> maps;
int factorial(int n){
int ans = 1;
for(int i = 1; i <= n; i++){
ans*=i;
}
return ans;
}
string to_lower(string s){
for(int i = 0; i < s.length(); i++){
if(s[i] >= 'a'){
s[i] = (s[i]-32);
}
}
return s;
}
int getfull(char c, int leng){
string s;
for(int i = 0; i < leng; i++){
s+=c;
}
return stoi(s);
}
string bin(long n)
{
long i;
string s;
s+='0';
for (i = 1 << 30; i > 0; i = i / 2)
{
if((n & i) != 0)
{
s+='1';
}
else
{
s+='0';
}
}
return s;
}
int binaryToDecimal(string n)
{
string num = n;
int dec_value = 0;
// Initializing base value to 1, i.e 2^0
int base = 1;
int len = num.length();
for (int i = len - 1; i >= 0; i--) {
if (num[i] == '1')
dec_value += base;
base = base * 2;
}
return dec_value;
}
void s(vector<int> v){
sort(v.begin(), v.end());
}
bool issquare(int n){
if(floor(sqrt(n)) == sqrt(n)) return true;
return false;
}
#define read(n) cin >> n;
long long int fast_exp(int base, int exp)
{
if(exp==1)
return base;
else
{
if(exp%2 == 0)
{
long long int base1 = pow(fast_exp(base, exp/2),2);
if(base1 >= 1000000007)
return base1%1000000007;
else
return base1;
}
else
{
long long int ans = (base* pow(fast_exp(base,(exp-1)/2),2));
if(ans >= 1000000007)
return ans%1000000007;
else
return ans;
}
}
}
ll xorupton(ll x){
ll xxor = 0;
if(x%4 == 1){
xxor = 1;
}
else if(x%4 == 2){
xxor = x+1;
}
else if(x%4==3){
xxor = 0;
}
else xxor = x;
return xxor;
}
#define read2(n,m) cin >> n >> m;
void solve(int tt){
int n;
cin >> n;
vector<int> v;
map<int,bool> mp;
for(int i = 0; i < n; i++){
int x;
cin >> x;
v.push_back(x);
mp[x]=1;
}
int buff = 0;
sort(v.rbegin(), v.rend());
for(int i = 0; i < v.size()/2; i++){
cout << v[i] << " " << v[v.size() - 1] << "\n";
}
}
int main(){
int t = 1;
cin >> t;
int x = 1;
while(t--){
solve(x);
x++;
}
}
981A - Antipalindrome | 365A - Good Number |
1204B - Mislove Has Lost an Array | 1409D - Decrease the Sum of Digits |
1476E - Pattern Matching | 1107A - Digits Sequence Dividing |
1348A - Phoenix and Balance | 1343B - Balanced Array |
1186A - Vus the Cossack and a Contest | 1494A - ABC String |
1606A - AB Balance | 1658C - Shinju and the Lost Permutation |
1547C - Pair Programming | 550A - Two Substrings |
797B - Odd sum | 1093A - Dice Rolling |
1360B - Honest Coach | 1399C - Boats Competition |
1609C - Complex Market Analysis | 1657E - Star MST |
1143B - Nirvana | 1285A - Mezo Playing Zoma |
919B - Perfect Number | 894A - QAQ |
1551A - Polycarp and Coins | 313A - Ilya and Bank Account |
1469A - Regular Bracket Sequence | 919C - Seat Arrangements |
1634A - Reverse and Concatenate | 1619C - Wrong Addition |