source_code: import java.util.*;
  import java.io.*;
  
  public class E {
      public static void main(String[] args) {
          FastScanner scanner = new FastScanner();
          PrintWriter out = new PrintWriter(System.out, false);
          int t = scanner.nextInt();
          while(t-->0) {
              int n = scanner.nextInt();
              int m = scanner.nextInt();
              int[][] cols = new int[m][n];
              for(int i = 0; i < n; i++) {
                  for(int j =0; j < m; j++) {
                      cols[j][i] = scanner.nextInt();
                  }
              }
              int maxMask = 1 << n;
              int[] dp = new int[maxMask];
              Arrays.fill(dp, -1);
              dp[0] = 0;
              for(int i = 0; i < m; i++) {
                  for(int mask = maxMask-1; mask>=0; mask--) {
                      int[] arr = cols[i].clone();
                      for(int j = 0; j < n; j++) {
                          for(int smask = mask; smask >= 0; smask = (smask-1)&mask) {
                              if (dp[smask] == -1) continue;
                              int add = 0;
                              for(int k = 0; k < n; k++) {
                                  if (((mask^smask)&(1 << k)) > 0) add += arr[k];
                              }
                              dp[mask] = Math.max(dp[mask], dp[smask] + add);
                              if (smask == 0) break;
                          }
                          arr = shift(arr);
                      }
                  }
              }
              out.println(dp[maxMask-1]);
          }
          out.flush();
      }
      static int[] shift (int[] a) {
          int[] b = new int[a.length];
          b[0] = a[a.length-1];
          for(int i = 0; i < a.length-1; i++) {
              b[i+1] = a[i];
          }
          return b;
      }
      public static class FastScanner {
          BufferedReader br;
          StringTokenizer st;
          
          public FastScanner(Reader in) {
              br = new BufferedReader(in);
          }
          
          public FastScanner() {
              this(new InputStreamReader(System.in));
          }
          
          String next() {
              while (st == null || !st.hasMoreElements()) {
                  try {
                      st = new StringTokenizer(br.readLine());
                  } catch (IOException e) {
                      e.printStackTrace();
                  }
              }
              return st.nextToken();
          }
          
          int nextInt() {
              return Integer.parseInt(next());
          }
          
          long nextLong() {
              return Long.parseLong(next());
          }
          
          double nextDouble() {
              return Double.parseDouble(next());
          }
          
          String readNextLine() {
              String str = "";
              try {
                  str = br.readLine();
              } catch (IOException e) {
                  e.printStackTrace();
              }
              return str;
          }
      }
  }
  