#include <climits>
#include <cstdio>
#include <cstring>
#include <cctype>
#include <cmath>
#include <ctime>
#include <cstdlib>
#include <cstdarg>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <sstream>
#include <exception>
#include <stdexcept>
#include <memory>
#include <locale>
#include <bitset>
#include <deque>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <vector>
#include <algorithm>
#include <iterator>
#include <functional>
#include <string>
#include <complex>
#include <valarray>

#define MS(a, b) memset(a, b, sizeof a)
#define LB(x) ((x) & (-x))
#define REP(a, b, c) for(int a = b; a < c; ++a)
#define REP1(a, b, c) for(int a = b; a <= c; ++a)

using namespace std;
typedef long long ll;
const int N = 1e5+17;
const ll MOD = 1e9+7;

int n, l, r;

struct P{
    int x;
    int id;
    P(int x = 0, int id = 0) : x(x), id(id) {}
    bool operator < (const P& a)const {
        return x < a.x || (x == a.x && id > a.id) ;
    }
};

vector<P > v;

ll po[N];

void init() {
    po[0] = 1LL;
    REP1(i, 1, N) po[i] = (po[i-1] * 2) % MOD;
    return ;
}

long long  val(int y) {
    return (po[y] - 1) * po[n-y] % MOD;
}

int main()
{
#ifdef PIT
freopen("1002.in", "r", stdin);
#endif // PIT
    int T;
    init();
    scanf("%d", &T);
    while(T--) {
        scanf("%d", &n);
        v.clear();
        REP(i, 0, n) {
            scanf("%d %d", &l, &r);
            v.push_back(P(l, 1));
            v.push_back(P(r, -1));
        }
        int len = v.size();
        sort(v.begin(), v.end());
//for(int i = 0; i < len; ++i) printf("%d %d  ", v[i].x, v[i].id); puts("");
        int k = 1;
        long long res = 0;
        for(int i = 1; i < len; ++i) {
            if(v[i].id == 1) {
                int dis = v[i].x - v[i-1].x;
                res = (res + (val(k) * dis % MOD)) % MOD ;
                ++k;
            } else if(v[i].id == -1) {
                int dis = v[i].x - v[i-1].x;
                res = (res + (val(k) * dis % MOD)) % MOD ;
                --k;
            }

        }
        printf("%I64d\n", res);
    }
    return 0;
}