On a circle lie 2n distinct points, with the following property: however you choose 3 chords that connect 3 disjoint pairs of points, no point strictly inside the circle belongs to all 3 chords. The points are numbered 1,   2,   ...,   2n in clockwise order.

Initially, k chords connect k pairs of points, in such a way that all the 2k endpoints of these chords are distinct.

You want to draw n - k additional chords that connect the remaining 2(n - k) points (each point must be an endpoint of exactly one chord).

In the end, let x be the total number of intersections among all n chords. Compute the maximum value that x can attain if you choose the n - k chords optimally.

Note that the exact position of the 2n points is not relevant, as long as the property stated in the first paragraph holds.

Input

The first line contains a single integer t (1 ≤ t ≤ 100) — the number of test cases. Then t test cases follow.

The first line of each test case contains two integers n and k (1 ≤ n ≤ 100, 0 ≤ k ≤ n) — half the number of points and the number of chords initially drawn.

Then k lines follow. The i-th of them contains two integers x_i and y_i (1 ≤ x_i,   y_i ≤ 2n, x_i ≠ y_i) — the endpoints of the i-th chord. It is guaranteed that the 2k numbers x_1,   y_1,   x_2,   y_2,   ...,   x_k,   y_k are all distinct.

Output

For each test case, output the maximum number of intersections that can be obtained by drawing n - k additional chords.

Example

Input


4
4 2
8 2
1 5
1 1
2 1
2 0
10 6
14 6
2 20
9 10
13 18
15 12
11 7


Output


4
0
1
14

Note

In the first test case, there are three ways to draw the 2 additional chords, shown below (black chords are the ones initially drawn, while red chords are the new ones):

<image>

We see that the third way gives the maximum number of intersections, namely 4.

In the second test case, there are no more chords to draw. Of course, with only one chord present there are no intersections.

In the third test case, we can make at most one intersection by drawing chords 1-3 and 2-4, as shown below:

<image>
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.*;

public class Main {
    public static void main(String[] args){
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        solve(in, out);
        out.close();
    }

    static String reverse(String s) {
        return (new StringBuilder(s)).reverse().toString();
    }

    static void sieveOfEratosthenes(int n, int factors[], ArrayList<Integer> ar) 
    { 
        factors[1]=1;
        int p;
        for(p = 2; p*p <=n; p++) 
        { 
            if(factors[p] == 0) 
            { 
                ar.add(p);
                factors[p]=p;
                for(int i = p*p; i <= n; i += p) 
                    if(factors[i]==0)
                        factors[i] = p; 
            } 
        } 
        for(;p<=n;p++){
            if(factors[p] == 0) 
            { 
                factors[p] = p;
                ar.add(p);
            } 
        }
    }

    static void sort(int ar[]) {
        int n = ar.length;
        ArrayList<Integer> a = new ArrayList<>();
        for (int i = 0; i < n; i++)
            a.add(ar[i]);
        Collections.sort(a);
        for (int i = 0; i < n; i++)
            ar[i] = a.get(i);
    }

    static void sort1(long ar[]) {
        int n = ar.length;
        ArrayList<Long> a = new ArrayList<>();
        for (int i = 0; i < n; i++)
            a.add(ar[i]);
        Collections.sort(a);
        for (int i = 0; i < n; i++)
            ar[i] = a.get(i);
    }

    static void sort2(char ar[]) {
        int n = ar.length;
        ArrayList<Character> a = new ArrayList<>();
        for (int i = 0; i < n; i++)
            a.add(ar[i]);
        Collections.sort(a);
        for (int i = 0; i < n; i++)
            ar[i] = a.get(i);
    }

    static long ncr(long n, long r, long mod) {
        if (r == 0)
            return 1;
        long val = ncr(n - 1, r - 1, mod);
        val = (n * val) % mod;
        val = (val * modInverse(r, mod)) % mod;
        return val;
    }

    static void build(int t1[], int a[], int v, int tl, int tr) {
        if (tl == tr) {
            t1[v] = a[tl];
        } else {
            int tm = (tl + tr) / 2;
            build(t1, a, v*2, tl, tm);
            build(t1, a, v*2+1, tm+1, tr);
            t1[v] = 0;
        }
    }

    static void update(int t1[], int v, int tl, int tr, int x, int new_val) {
        // if (tl > tr) 
        //     return;
        t1[v] = Math.max(new_val,t1[v]);
        if(tl==tr)
            return;
        int tm = (tl + tr) / 2;
        if(x<=tm)
            update(t1, v*2, tl, tm, x, new_val);
        else
            update(t1, v*2+1, tm+1, tr, x, new_val);
    }

    static int get(int t1[], int v, int tl, int tr, int l, int r) {
        if (tl >= l && tr <= r) {
            return t1[v];
        }
        int tm = (tl + tr) / 2;
        int max = 0;
        if(l<=tm)
            max = Math.max(get(t1, v*2, tl, tm, l, r),max);
        if(r>=tm+1)
            max = Math.max(get(t1, v*2+1, tm+1, tr, l, r), max);
        return max;
    }

    public static void solve(InputReader sc, PrintWriter pw){
        int i, j = 0;
        // int t = 1; 
        long mod = 1000000007;
        int t = sc.nextInt();
        u: while (t-- > 0) {
            int n = sc.nextInt();
            int k = sc.nextInt();
            int p[][] = new int[n][2];
            long count = 0;
            int taken[] = new int[2*n+1];
            for(i=0;i<k;i++){
                p[i][0] = sc.nextInt();
                p[i][1] = sc.nextInt();
                if(p[i][0]>p[i][1]){
                    int tmp = p[i][0];
                    p[i][0] = p[i][1];
                    p[i][1] = tmp;
                }
                for(j=0;j<i;j++){
                    if(p[j][0]>=p[i][0]&&p[j][0]<=p[i][1]&&(p[j][1]<=p[i][0]||p[j][1]>=p[i][1])){
                        count++;
                    }
                    else if(p[j][1]>=p[i][0]&&p[j][1]<=p[i][1]&&(p[j][0]<=p[i][0]||p[j][0]>=p[i][1])){
                        count++;
                    }
                }
                taken[p[i][0]] = 1;
                taken[p[i][1]] = 1;
            }
            ArrayList<Integer> ar = new ArrayList<>();
            for(i=1;i<=2*n;i++){
                if(taken[i]==0){
                    ar.add(i);
                }
            }
            int y = n-k;
            for(i=k;i<n;i++){
                p[i][0] = ar.get(i-k);
                p[i][1] = ar.get((i-k+y)%(2*(n-k)));
                if(p[i][0]>p[i][1]){
                    int tmp = p[i][0];
                    p[i][0] = p[i][1];
                    p[i][1] = tmp;
                }
                for(j=0;j<i;j++){
                    if(p[j][0]>=p[i][0]&&p[j][0]<=p[i][1]&&(p[j][1]<=p[i][0]||p[j][1]>=p[i][1])){
                        count++;
                    }
                    else if(p[j][1]>=p[i][0]&&p[j][1]<=p[i][1]&&(p[j][0]<=p[i][0]||p[j][0]>=p[i][1])){
                        count++;
                    }
                }
            }
            pw.println(count);
        }
    }

    static void KMPSearch(char pat[], char txt[], int pres[])
    {
        int M = pat.length;
        int N = txt.length;
        int lps[] = new int[M];
        int j = 0; 
        computeLPSArray(pat, M, lps);
        int i = 0;
        while (i < N) {
            if (pat[j] == txt[i]) {
                j++;
                i++;
            }
            if (j == M) {
                pres[i-1] = 1;
                j = lps[j - 1];
            }
            else if (i < N && pat[j] != txt[i]) {
                if (j != 0)
                    j = lps[j - 1];
                else
                    i = i + 1;
            }
        }
    }
  
    static void computeLPSArray(char pat[], int M, int lps[])
    {
        int len = 0;
        int i = 1;
        lps[0] = 0; 
        while (i < M) {
            if (pat[i] == pat[len]) {
                len++;
                lps[i] = len;
                i++;
            }
            else 
            {
                if (len != 0) {
                    len = lps[len - 1];
                }
                else
                {
                    lps[i] = len;
                    i++;
                }
            }
        }
    }

    static void findPrimes(int num, HashMap<Integer, Integer> pos, ArrayList<Integer> ar){
        for(int i=2;i*i<num;i++){
            if(num%i==0){
                while(num%i==0){
                    num/=i;
                }
                if(pos.containsKey(i))
                    continue;
                ar.add(i);
                pos.put(i,ar.size()-1);
            }
        }
        if(num>1){
            if(!pos.containsKey(num)){
                ar.add(num);
                pos.put(num,ar.size()-1);
            }
        }
    }

    static long[][] matrixMult(long a[][], long b[][], long mod){
        int n = a.length;
        int m = a[0].length;
        int p = b[0].length;
        long c[][] = new long[n][p];
        for(int i=0;i<n;i++){
            for(int j=0;j<m;j++){
                for(int k=0;k<p;k++){
                    c[i][k] += a[i][j]*b[j][k];
                    c[i][k] %= mod;
                }
            }
        }
        return c;
    }

    static long[][] exp(long mat[][], long b, long mod){
        if(b==0){
            int n = mat.length;
            long res[][] = new long[n][n];
            for(int i=0;i<n;i++){
                res[i][i] = 1;
            }
            return res;
        }
        long half[][] = exp(mat, b/2, mod);
        long res[][] = matrixMult(half, half, mod);
        if(b%2==1){
            res = matrixMult(res, mat, mod);
        }
        return res;
    }

    static void countPrimeFactors(int num, int a[], HashMap<Integer,Integer> pos){
        for(int i=2;i*i<num;i++){
            if(num%i==0){
                int y = pos.get(i);
                while(num%i==0){
                    a[y]++;
                    num/=i;
                }
            }
        }
        if(num>1){
            int y = pos.get(num);
            a[y]++;
        }
    }

    static void assignAnc(ArrayList<Integer> ar[], int depth[], int sz[], int par[][] ,int curr, int parent, int d){
        depth[curr] = d;
        sz[curr] = 1;
        par[curr][0] = parent;
        for(int v:ar[curr]){
            if(parent==v)
                continue;
            assignAnc(ar, depth, sz, par, v, curr, d+1);
            sz[curr] += sz[v];
        }
    }

    static int findLCA(int a, int b, int par[][], int depth[]){
        if(depth[a]>depth[b]){
            a = a^b;
            b = a^b;
            a = a^b;
        }
        int diff = depth[b] - depth[a];
        for(int i=19;i>=0;i--){
            if((diff&(1<<i))>0){
                b = par[b][i];
            }
        }
        if(a==b)
            return a;
        for(int i=19;i>=0;i--){
            if(par[b][i]!=par[a][i]){
                b = par[b][i];
                a = par[a][i];
            }
        }
        return par[a][0];
    }

    static void formArrayForBinaryLifting(int n, int par[][]){
        for(int j=1;j<20;j++){
            for(int i=0;i<n;i++){
                if(par[i][j-1]==-1)
                    continue;
                par[i][j] = par[par[i][j-1]][j-1];
            }
        }
    }

    static long lcm(int a, int b){
        return a*b/gcd(a,b);
    }

    static class Pair1 {
        long a;
        long b;
        
        Pair1(long a, long b) {
            this.a = a;
            this.b = b;
        }
    }

    static class Pair implements Comparable<Pair> {
        int a;
        int b;
        // int c;
        
        Pair(int a, int b) {
            this.a = a;
            this.b = b;
            // this.c = c;
        }
 
        public int compareTo(Pair p) {
            if(a!=p.a)
                return a-p.a;
            return b-p.b;
        }
    }

    static boolean isPrime(int n) { 
        if (n <= 1) 
            return false; 
        if (n <= 3) 
            return true; 
        if (n % 2 == 0 ||  n % 3 == 0) 
            return false; 
        for (int i = 5; i * i <= n; i = i + 6) 
            if (n % i == 0 || n % (i + 2) == 0) 
                return false; 
        return true; 
    } 

    static long gcd(long a, long b) {
        if (b == 0)
            return a;
        return gcd(b, a % b);
    }

    static long fast_pow(long base, long n, long M) {
        if (n == 0)
            return 1;
        if (n == 1)
            return base % M;
        long halfn = fast_pow(base, n / 2, M);
        if (n % 2 == 0)
            return (halfn * halfn) % M;
        else
            return (((halfn * halfn) % M) * base) % M;
    }

    static long modInverse(long n, long M) {
        return fast_pow(n, M - 2, M);
    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 9992768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

        public long nextLong() {
            return Long.parseLong(next());
        }
    }
}