#define _USE_MATH_DEFINES

#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset
#include <cmath>		//sqrt, ceil. M_PI, pow, sin
#include <ios>			//fixed
#include <iomanip>		//setprecision
#include <sstream>		//stringstream
#include <numeric>		//gcd, assumlate
#include <random>		//randam_device
#include <limits>		//numeric_limits

using namespace std;
constexpr long long int D_MOD = 1000000007;

int main() {

    int T, N;
    cin >> T;

    int temp = 0;
    for (int i = 0; i < T; i++) {
        cin >> N;
        temp = N * (N + 1) / 2;
        if (temp % 2 == 0) {
            string ans;
            for (int i = 0; i < N / 2; i++) {
                if (i % 2 == 0) {
                    ans.insert(0, "0");
                    ans.push_back('0');
                }
                else {
                    ans.insert(0, "1");
                    ans.push_back('1');
                }
            }
            if (N % 2 != 0) {
                ans.push_back('1');
            }
            cout << ans << endl;
        }
        else {
            cout << -1 << endl;
        }
    }

    return 0;

}