#include <bits/stdc++.h>
using namespace std;
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
 
#define ms(s, n) memset(s, n, sizeof(s))
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define FORd(i, a, b) for (int i = (a) - 1; i >= (b); --i)
#define FORall(it, a) for (__typeof((a).begin()) it = (a).begin(); it != (a).end(); it++)
#define sz(a) int((a).size())
#define present(t, x) (t.find(x) != t.end())
#define all(a) (a).begin(), (a).end()
#define uni(a) (a).erase(unique(all(a)), (a).end())
#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define prec(n) fixed<<setprecision(n)
#define bit(n, i) (((n) >> (i)) & 1)
#define bitcount(n) __builtin_popcountll(n)
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef vector<int> vi;
typedef vector<pi> vii;
const int MOD = (int) 1e9 + 7;
const int FFTMOD = 119 << 23 | 1;
const int INF = (int) 1e9 + 23111992;
const ll LINF = (ll) 1e18 + 23111992;
const ld PI = acos((ld) -1);
const ld EPS = 1e-9;
inline ll gcd(ll a, ll b) {ll r; while (b) {r = a % b; a = b; b = r;} return a;}
inline ll lcm(ll a, ll b) {return a / gcd(a, b) * b;}
inline ll fpow(ll n, ll k, int p = MOD) {ll r = 1; for (; k; k >>= 1) {if (k & 1) r = r * n % p; n = n * n % p;} return r;}
template<class T> inline int chkmin(T& a, const T& val) {return val < a ? a = val, 1 : 0;}
template<class T> inline int chkmax(T& a, const T& val) {return a < val ? a = val, 1 : 0;}
inline ull isqrt(ull k) {ull r = sqrt(k) + 1; while (r * r > k) r--; return r;}
inline ll icbrt(ll k) {ll r = cbrt(k) + 1; while (r * r * r > k) r--; return r;}
inline void addmod(int& a, int val, int p = MOD) {if ((a = (a + val)) >= p) a -= p;}
inline void submod(int& a, int val, int p = MOD) {if ((a = (a - val)) < 0) a += p;}
inline int mult(int a, int b, int p = MOD) {return (ll) a * b % p;}
inline int inv(int a, int p = MOD) {return fpow(a, p - 2, p);}
inline int sign(ld x) {return x < -EPS ? -1 : x > +EPS;}
inline int sign(ld x, ld y) {return sign(x - y);}
mt19937 mt(chrono::high_resolution_clock::now().time_since_epoch().count());
inline int mrand() {return abs((int) mt());}
inline int mrand(int k) {return abs((int) mt()) % k;}
#define db(x) cerr << "[" << #x << ": " << (x) << "] ";
#define endln cerr << "\n";

template<class TK, class TV> struct HashTable {
    static const int MAXN = 20000000;
    static const int MAGIC = 7654321;
    int ptr;
    int lst[MAGIC];
    int prv[MAXN];
    TK l[MAXN];
    TV x[MAXN];
    int cnt;
    int used[MAGIC];

    HashTable() {
        ptr = 0;
        fill_n(lst, MAGIC, -1);
        cnt = 0;
    }
    void clear() {
        ptr = 0;
        for (int i = 0; i < cnt; i++) {
            lst[used[i]] = -1;
        }
        cnt = 0;
    }
    TV& operator [] (const TK& key) {
        int hs = (key % MAGIC + MAGIC) % MAGIC;
        if (!~lst[hs]) {
            used[cnt++] = hs;
        }
        for (int e = lst[hs]; ~e; e = prv[e]) {
            if (l[e] == key) {
                return x[e];
            }
        }
        l[ptr] = key, x[ptr] = 0;
        prv[ptr] = lst[hs], lst[hs] = ptr;
        return x[ptr++];
    }
    int count(TK key) {
        int hs = (key % MAGIC + MAGIC) % MAGIC;
        for (int e = lst[hs]; ~e; e = prv[e]) {
            if (l[e] == key) {
                return 1;
            }
        }
        return 0;
    }
    void erase(TK key) {
        int hs = (key % MAGIC + MAGIC) % MAGIC;
        int nxt = -1;
        for (int e = lst[hs]; ~e; e = prv[e]) {
            if (l[e] == key) {
                if (!~nxt) {
                    lst[hs] = prv[e];
                }
                else {
                    prv[nxt] = prv[e];
                }
                return;
            }
            nxt = e;
        }
    }
};

HashTable<long long, int> hs;

void chemthan() {
    int test; cin >> test;
    while (test--) {
        int n; cin >> n;
        vector<vi> a(n);
        vi dc;
        FOR(i, 0, n) {
            int k; cin >> k;
            while (k--) {
                int x; cin >> x;
                a[i].pb(x);
                dc.pb(x);
            }
            sort(all(a[i]));
        }
        sort(all(dc)), uni(dc);
        FOR(i, 0, n) {
            for (int& x : a[i]) x = lower_bound(all(dc), x) - dc.begin();
        }
        vi perm(n);
        FOR(i, 0, n) perm[i] = i;
        sort(all(perm), [&] (int u, int v) {
                return sz(a[v]) < sz(a[u]);
                }
            );
        vi f(sz(dc));
        auto solve = [&] () {
            FOR(i, 0, n) {
                for (int x : a[i]) {
                    long long key = (long long) i * INF + x;
                    hs[key] = 1;
                }
            }
            auto check = [&] (int j) {
                int num = 0;
                for (int x : a[j]) {
                    if (f[x]) {
                        num++;
                    }
                }
                return 2 <= num;
            };
            int magic = min(n, 500);
            FOR(i, 0, magic) {
                for (int x : a[perm[i]]) {
                    f[x] = 1;
                }
                FOR(j, i + 1, n) {
                    if (check(perm[j])) {
                        cout << perm[i] + 1 << " " << perm[j] + 1 << "\n";
                        return;
                    }
                }
                for (int x : a[perm[i]]) {
                    f[x] = 0;
                }
            }
            hs.clear();
            FOR(ii, magic, n) {
                int i = perm[ii];
                FOR(u, 0, sz(a[i])) FOR(v, u + 1, sz(a[i])) {
                    int x = a[i][u];
                    int y = a[i][v];
                    long long key = (long long) x * INF + y;
                    auto& t = hs[key];
                    if (t) {
                        cout << t << " " << i + 1 << "\n";
                        return;
                    }
                    t = i + 1;
                }
            }
            cout << -1 << "\n";
        };
        solve();
    }
}

int32_t main(int32_t argc, char* argv[]) {
    ios_base::sync_with_stdio(0), cin.tie(0);
    if (argc > 1) {
        assert(freopen(argv[1], "r", stdin));
    }
    if (argc > 2) {
        assert(freopen(argv[2], "wb", stdout));
    }
    chemthan();
    cerr << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}

### Prompt

Construct a Cpp code solution to the problem outlined:

You are given n sets of integers. The i-th set contains k_i integers.

Two sets are called similar if they share at least two common elements, i. e. there exist two integers x and y such that x ≠ y, and they both belong to each of the two sets.

Your task is to find two similar sets among the given ones, or report that there is no such pair of sets.

Input

The first line contains a single integer t (1 ≤ t ≤ 50000) — the number of test cases. Then t test cases follow.

The first line of each test case contains a single integer n (2 ≤ n ≤ 10^5) the number of given sets. The following n lines describe the sets. The i-th line starts with an integer k_i (2 ≤ k_i ≤ 10^5) — the number of integers in the i-th set. Then k_i integers a_{i,1}, a_{i,2}, ..., a_{i,k_i} (1 ≤ a_{i,j} ≤ 10^9) follow — the elements of the i-th set. It is guaranteed that all elements in each set are different.

The total number of elements in all sets in all test cases is not greater than 2⋅ 10^5.

Output

For each test case, print the answer on a single line. 

If there is no pair of similar sets, print -1. 

Otherwise, print two different integers — the indices of the similar sets. The sets are numbered from 1 to n in the order they are given in the input. If there are multiple answers, print any of them.

Example

Input


3
4
2 1 10
3 1 3 5
5 5 4 3 2 1
3 10 20 30
3
4 1 2 3 4
4 2 3 4 5
4 3 4 5 6
2
3 1 3 5
3 4 3 2


Output


2 3 
1 2 
-1

### Response

```cpp
#include <bits/stdc++.h>
using namespace std;
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
 
#define ms(s, n) memset(s, n, sizeof(s))
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define FORd(i, a, b) for (int i = (a) - 1; i >= (b); --i)
#define FORall(it, a) for (__typeof((a).begin()) it = (a).begin(); it != (a).end(); it++)
#define sz(a) int((a).size())
#define present(t, x) (t.find(x) != t.end())
#define all(a) (a).begin(), (a).end()
#define uni(a) (a).erase(unique(all(a)), (a).end())
#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define prec(n) fixed<<setprecision(n)
#define bit(n, i) (((n) >> (i)) & 1)
#define bitcount(n) __builtin_popcountll(n)
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef vector<int> vi;
typedef vector<pi> vii;
const int MOD = (int) 1e9 + 7;
const int FFTMOD = 119 << 23 | 1;
const int INF = (int) 1e9 + 23111992;
const ll LINF = (ll) 1e18 + 23111992;
const ld PI = acos((ld) -1);
const ld EPS = 1e-9;
inline ll gcd(ll a, ll b) {ll r; while (b) {r = a % b; a = b; b = r;} return a;}
inline ll lcm(ll a, ll b) {return a / gcd(a, b) * b;}
inline ll fpow(ll n, ll k, int p = MOD) {ll r = 1; for (; k; k >>= 1) {if (k & 1) r = r * n % p; n = n * n % p;} return r;}
template<class T> inline int chkmin(T& a, const T& val) {return val < a ? a = val, 1 : 0;}
template<class T> inline int chkmax(T& a, const T& val) {return a < val ? a = val, 1 : 0;}
inline ull isqrt(ull k) {ull r = sqrt(k) + 1; while (r * r > k) r--; return r;}
inline ll icbrt(ll k) {ll r = cbrt(k) + 1; while (r * r * r > k) r--; return r;}
inline void addmod(int& a, int val, int p = MOD) {if ((a = (a + val)) >= p) a -= p;}
inline void submod(int& a, int val, int p = MOD) {if ((a = (a - val)) < 0) a += p;}
inline int mult(int a, int b, int p = MOD) {return (ll) a * b % p;}
inline int inv(int a, int p = MOD) {return fpow(a, p - 2, p);}
inline int sign(ld x) {return x < -EPS ? -1 : x > +EPS;}
inline int sign(ld x, ld y) {return sign(x - y);}
mt19937 mt(chrono::high_resolution_clock::now().time_since_epoch().count());
inline int mrand() {return abs((int) mt());}
inline int mrand(int k) {return abs((int) mt()) % k;}
#define db(x) cerr << "[" << #x << ": " << (x) << "] ";
#define endln cerr << "\n";

template<class TK, class TV> struct HashTable {
    static const int MAXN = 20000000;
    static const int MAGIC = 7654321;
    int ptr;
    int lst[MAGIC];
    int prv[MAXN];
    TK l[MAXN];
    TV x[MAXN];
    int cnt;
    int used[MAGIC];

    HashTable() {
        ptr = 0;
        fill_n(lst, MAGIC, -1);
        cnt = 0;
    }
    void clear() {
        ptr = 0;
        for (int i = 0; i < cnt; i++) {
            lst[used[i]] = -1;
        }
        cnt = 0;
    }
    TV& operator [] (const TK& key) {
        int hs = (key % MAGIC + MAGIC) % MAGIC;
        if (!~lst[hs]) {
            used[cnt++] = hs;
        }
        for (int e = lst[hs]; ~e; e = prv[e]) {
            if (l[e] == key) {
                return x[e];
            }
        }
        l[ptr] = key, x[ptr] = 0;
        prv[ptr] = lst[hs], lst[hs] = ptr;
        return x[ptr++];
    }
    int count(TK key) {
        int hs = (key % MAGIC + MAGIC) % MAGIC;
        for (int e = lst[hs]; ~e; e = prv[e]) {
            if (l[e] == key) {
                return 1;
            }
        }
        return 0;
    }
    void erase(TK key) {
        int hs = (key % MAGIC + MAGIC) % MAGIC;
        int nxt = -1;
        for (int e = lst[hs]; ~e; e = prv[e]) {
            if (l[e] == key) {
                if (!~nxt) {
                    lst[hs] = prv[e];
                }
                else {
                    prv[nxt] = prv[e];
                }
                return;
            }
            nxt = e;
        }
    }
};

HashTable<long long, int> hs;

void chemthan() {
    int test; cin >> test;
    while (test--) {
        int n; cin >> n;
        vector<vi> a(n);
        vi dc;
        FOR(i, 0, n) {
            int k; cin >> k;
            while (k--) {
                int x; cin >> x;
                a[i].pb(x);
                dc.pb(x);
            }
            sort(all(a[i]));
        }
        sort(all(dc)), uni(dc);
        FOR(i, 0, n) {
            for (int& x : a[i]) x = lower_bound(all(dc), x) - dc.begin();
        }
        vi perm(n);
        FOR(i, 0, n) perm[i] = i;
        sort(all(perm), [&] (int u, int v) {
                return sz(a[v]) < sz(a[u]);
                }
            );
        vi f(sz(dc));
        auto solve = [&] () {
            FOR(i, 0, n) {
                for (int x : a[i]) {
                    long long key = (long long) i * INF + x;
                    hs[key] = 1;
                }
            }
            auto check = [&] (int j) {
                int num = 0;
                for (int x : a[j]) {
                    if (f[x]) {
                        num++;
                    }
                }
                return 2 <= num;
            };
            int magic = min(n, 500);
            FOR(i, 0, magic) {
                for (int x : a[perm[i]]) {
                    f[x] = 1;
                }
                FOR(j, i + 1, n) {
                    if (check(perm[j])) {
                        cout << perm[i] + 1 << " " << perm[j] + 1 << "\n";
                        return;
                    }
                }
                for (int x : a[perm[i]]) {
                    f[x] = 0;
                }
            }
            hs.clear();
            FOR(ii, magic, n) {
                int i = perm[ii];
                FOR(u, 0, sz(a[i])) FOR(v, u + 1, sz(a[i])) {
                    int x = a[i][u];
                    int y = a[i][v];
                    long long key = (long long) x * INF + y;
                    auto& t = hs[key];
                    if (t) {
                        cout << t << " " << i + 1 << "\n";
                        return;
                    }
                    t = i + 1;
                }
            }
            cout << -1 << "\n";
        };
        solve();
    }
}

int32_t main(int32_t argc, char* argv[]) {
    ios_base::sync_with_stdio(0), cin.tie(0);
    if (argc > 1) {
        assert(freopen(argv[1], "r", stdin));
    }
    if (argc > 2) {
        assert(freopen(argv[2], "wb", stdout));
    }
    chemthan();
    cerr << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}

```