C.cpp

/*
Templete by norman/KNN-07
*/
#include <bits/stdc++.h>
using namespace std;
#define el endl
#define mp make_pair
#define pb push_back
#define ppb pop_back
#define pf push_front
#define fi first
#define nd second
#define forinc(i, a, b) for (int i = a; i <= b; i++)
#define fordec(i, a, b) for (int i = a; i >= b; i--)
#define mms(a, v) memset(a, v, sizeof(a))
#define lwb(a, v) lower_bound(a.begin(), a.end(), v)
#define upb(a, v) upper_bound(a.begin(), a.end(), v)
typedef long long ll;
typedef long double ldb;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef map<int, int> mii;
typedef map<ll, ll> mll;
typedef vector<bool> vb;
typedef unordered_set<char> chrset;
const string taskname = "";
const bool tc = true;

void solve()
{
    int n, x;
    cin >> n >> x;
    if ((n % x))
    {
        cout << -1;
        return;
    }
    vi a(n);
    a[0] = x;
    iota(a.begin() + 1, a.end(), 2);
    a[x - 1] = n;
    a[n - 1] = 1;
    for (int i = 2; i < n; i++)
        for (int j = i * 2; j < n; j += i)
            if (a[i - 1] % j == 0 and a[i - 1] > a[j - 1])
                swap(a[i - 1], a[j - 1]);
    for (auto x : a)
        cout << x << ' ';
}

int main()
{
    if (fopen((taskname + ".inp").c_str(), "r"))
    {
        freopen((taskname + ".inp").c_str(), "r", stdin);
        freopen((taskname + ".out").c_str(), "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int tsc = 1;
    if (tc)
    {
        cin >> tsc;
    }
    while (tsc--)
    {
        solve();
        cout << el;
    }
}