source_code: import java.io.*;
  import java.util.Arrays;
  import java.util.StringTokenizer;
  
  public class mainE {
      public static PrintWriter out = new PrintWriter(System.out);
      public static FastScanner enter = new FastScanner(System.in);
      public static void main(String[] args) throws IOException {
          int t=enter.nextInt();
          for (int i = 0; i < t; i++) {
              solve();
          }
          out.close();
      }
      public static int[][] arr=new int[13][2010];
      public static pair[] par= new pair[2010];
      private static void solve() throws IOException{
          int n=enter.nextInt();
          int m=enter.nextInt();
          for (int i = 0; i <n ; i++) {
              for (int j = 0; j <m ; j++) {
                  arr[i][j]=enter.nextInt();
              }
          }
          for (int i = 0; i <n ; i++) {
              for (int j = m; j <m+3 ; j++) {
                  arr[i][j]=0;
              }
          }
          m=m+3;
  
          for (int i = 0; i <m ; i++) {
              int max=-1;
              for (int j = 0; j <n ; j++) {
                  max=Math.max(arr[j][i], max);
              }
              par[i]=new pair(max,i);
          }
          Arrays.sort(par,0,m, pair::compareTo);
  
          int i0=par[0].st;
          int i1=par[1].st;
          int i2=par[2].st;
          int i3=par[3].st;
          int ans=-1;
          for (int i = 0; i <n ; i++) {
              for (int j = 0; j <n ; j++) {
                  for (int k = 0; k <n ; k++) {
                      for (int l = 0; l <n ; l++) {
                          int first=Math.max(Math.max(arr[i][i0],arr[j][i1]), Math.max(arr[k][i2],arr[l][i3]));
                          int second=Math.max(Math.max(arr[(i+1)%n][i0],arr[(j+1)%n][i1]), Math.max(arr[(k+1)%n][i2],arr[(l+1)%n][i3]));
                          int third=Math.max(Math.max(arr[(i+2)%n][i0],arr[(j+2)%n][i1]), Math.max(arr[(k+2)%n][i2],arr[(l+2)%n][i3]));
                          int fourth=Math.max(Math.max(arr[(i+3)%n][i0],arr[(j+3)%n][i1]), Math.max(arr[(k+3)%n][i2],arr[(l+3)%n][i3]));
                          if(n==1) {
                              second=0;
                              third=0;
                              fourth=0;
                          }
                          else if(n==2){
                              third=0;
                              fourth=0;
                          }
                          else if(n==3){
                              fourth=0;
                          }
                          ans=Math.max(ans, first+second+fourth+third);
  
                      }
                  }
              }
          }
          System.out.println(ans);
  
  
  
      }
  
      static class pair implements Comparable<pair>{
          int max,st;
  
          public pair(int max, int st) {
              this.max = max;
              this.st = st;
          }
  
          @Override
          public int compareTo(pair o) {
              return -Integer.compare(max, o.max);
          }
      }
  
      static class FastScanner {
          BufferedReader br;
          StringTokenizer stok;
  
          FastScanner(InputStream is) {
              br = new BufferedReader(new InputStreamReader(is));
          }
  
          String next() throws IOException {
              while (stok == null || !stok.hasMoreTokens()) {
                  String s = br.readLine();
                  if (s == null) {
                      return null;
                  }
                  stok = new StringTokenizer(s);
              }
              return stok.nextToken();
          }
  
          int nextInt() throws IOException {
              return Integer.parseInt(next());
          }
  
          long nextLong() throws IOException {
              return Long.parseLong(next());
          }
  
          double nextDouble() throws IOException {
              return Double.parseDouble(next());
          }
  
          char nextChar() throws IOException {
              return (char) (br.read());
          }
  
          String nextLine() throws IOException {
              return br.readLine();
          }
      }
  }
  