#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cmath>
#include <queue>
#include <stack>

#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
typedef long long ll;

using namespace std;


int inputValue(){
    int a;
    cin >> a;
    return a;
};

void inputArray(int * p, int a){
    rep(i, a){
        cin >> p[i];
    }
};

void inputVector(vector<int> * p, int a){
    rep(i, a){
        int input;
        cin >> input;
        p -> push_back(input);
    }
}

template <typename T>
void output(T a, int precision) {
    if(precision > 0){
        cout << setprecision(precision)  << a << "\n";
    }
    else{
        cout << a << "\n";
    }
}

int main(int argc, const char * argv[]) {
    
    // source code
    int T = inputValue();
    vector<int> R(T);
    rep(k, T){
        
        int N = inputValue();
        vector<int> A(N);
        vector<int> B(N);
        
        rep(i, N){
            A[i] = inputValue();
            B[N - i - 1] = A[i];
        }
        
        // first: 最長系列の長さ second: 直前の差分
        vector<pair<int, int> > up(N);
        vector<int> tempup(N);
        
        vector<pair<int, int> > down(N);
        vector<int> tempdown(N);
        
        
        
        
        repd(p, 1, N){
            rep(i, N){
                up[i].first = 1;
                up[i].second = 0;
            }
            repd(i, p, N){
                rep(j, i){
                    int fir = up[j].first + 1;
                    int sec = A[i] - A[j];
                    
                    if (fir > up[i].first) {
                        if (sec > up[j].second) {
                            up[i].first = fir;
                            up[i].second = sec;
                        }
                    }
                    if (fir == up[i].first) {
                        if (sec > up[j].second) {
                            up[i].second = min(up[i].second, sec);
                        }
                    }
                }
            }
            rep(i, N){
                tempup[i] = max(tempup[i], up[i].first);
            }
        }
        
        
        repd(p, 1, N){
            rep(i, N){
                down[i].first = 1;
                down[i].second = 0;
            }
            repd(i, p, N){
                rep(j, i){
                    int fir = down[j].first + 1;
                    int sec = B[i] - B[j];
                    
                    if (fir > down[i].first) {
                        if (sec > down[j].second) {
                            down[i].first = fir;
                            down[i].second = sec;
                        }
                    }
                    if (fir == down[i].first) {
                        if (sec > down[j].second) {
                            down[i].second = min(down[i].second, sec);
                            
                        }
                    }
                }
            }
            rep(i, N){
                tempdown[i] = max(tempdown[i], down[i].first);
            }
        }
        
        vector<int> sum(N);
        rep(i, N){
            sum[i] = tempup[i] + tempdown[N - 1 - i] - 1;
        }
        
        int ret = -1;
        rep(i, N){
            ret = max(ret, sum[i]);
        }
        
        R[k] = ret;
        
    }
    rep(i, T){
        output(R[i], 0);
    }
    
    return 0;
}