#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <cassert>
#include <fstream>
#include <utility>
#include <functional>
#include <time.h>
#include <stack>
#include <array>
#include <list>
#include <atcoder/all>
#define popcount __builtin_popcount
using namespace std;
using namespace atcoder;
typedef long long ll;
typedef pair<int, int> P;

int main()
{
    int t; cin>>t;
    while(t--){
        int n; cin>>n;
        vector<int> a(n);
        for(int i=0; i<n; i++){
            cin>>a[i];
        }
        bool ok=0;
        for(int u=0; u<2; u++){
            int c=0;
            for(int i=0; i<n-1; i++){
                if(i&1){
                    if(a[i]>a[i+1]) c++;
                }else{
                    if(a[i]<a[i+1]) c++;
                }
            }
            auto check=[&](int i, int j){
                if(i==j) return false;
                if(i>j) swap(i, j);
                int c1=c;
                if(i){
                    if(i&1){
                        if(a[i-1]<a[i]) c1--;
                        if(a[i-1]<a[j]) c1++;
                    }else{
                        if(a[i-1]>a[i]) c1--;
                        if(a[i-1]>a[j]) c1++;
                    }
                }
                if(j-i>1){
                    if(i&1){
                        if(a[i]>a[i+1]) c1--;
                        if(a[j]>a[i+1]) c1++;
                    }else{
                        if(a[i]<a[i+1]) c1--;
                        if(a[j]<a[i+1]) c1++;
                    }
                    if(j&1){
                        if(a[j-1]<a[j]) c1--;
                        if(a[j-1]<a[i]) c1++;
                    }else{
                        if(a[j-1]>a[j]) c1--;
                        if(a[j-1]>a[i]) c1++;
                    }
                }else{
                    if(i&1){
                        if(a[i]>a[j]) c1--;
                        if(a[j]>a[i]) c1++;
                    }else{
                        if(a[i]<a[j]) c1--;
                        if(a[j]<a[i]) c1++;
                    }
                }
                if(j<n-1){
                    if(j&1){
                        if(a[j]>a[j+1]) c1--;
                        if(a[i]>a[j+1]) c1++;
                    }else{
                        if(a[j]<a[j+1]) c1--;
                        if(a[i]<a[j+1]) c1++;
                    }
                }
                return c1==n-1;
            };
            int p=-1, q=-1;
            for(int i=0; i<n-2; i++){
                if(i<n-2 && a[i]==a[i+2]){
                    p=i, q=i+2;
                    break;
                }
            }
            for(int i=0; i<n-1; i++){
                if((i&1) && a[i]<=a[i+1]){
                    p=i, q=i+1;
                    break;
                }
                if(!(i&1) && a[i]>=a[i+1]){
                    p=i, q=i+1;
                    break;
                }
            }
            if(p==-1) continue;
            for(int i=0; i<n; i++){
                if(check(i, p)){
                    ok=1;
                    break;
                }
                if(check(i, q)){
                    ok=1;
                    break;
                }
            }
            if(ok) break;
            for(int i=0; i<n; i++) a[i]=-a[i];
        }
        if(ok) cout<<"Yes"<<endl;
        else cout<<"No"<<endl;
    }
    return 0;
}