description: Stephen Queen wants to write a story. He is a very unusual writer, he uses only letters 'a', 'b', 'c', 'd' and 'e'!
  
  To compose a story, Stephen wrote out n words consisting of the first 5 lowercase letters of the Latin alphabet. He wants to select the maximum number of words to make an interesting story.
  
  Let a story be a sequence of words that are not necessarily different. A story is called interesting if there exists a letter which occurs among all words of the story more times than all other letters together.
  
  For example, the story consisting of three words "bac", "aaada", "e" is interesting (the letter 'a' occurs 5 times, all other letters occur 4 times in total). But the story consisting of two words "aba", "abcde" is not (no such letter that it occurs more than all other letters in total).
  
  You are given a sequence of n words consisting of letters 'a', 'b', 'c', 'd' and 'e'. Your task is to choose the maximum number of them to make an interesting story. If there's no way to make a non-empty story, output 0.
  
  Input
  
  The first line contains one integer t (1 ≤ t ≤ 5000) — the number of test cases. Then t test cases follow.
  
  The first line of each test case contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of the words in the sequence. Then n lines follow, each of them contains a word — a non-empty string consisting of lowercase letters of the Latin alphabet. The words in the sequence may be non-distinct (i. e. duplicates are allowed). Only the letters 'a', 'b', 'c', 'd' and 'e' may occur in the words.
  
  It is guaranteed that the sum of n over all test cases doesn't exceed 2 ⋅ 10^5; the sum of the lengths of all words over all test cases doesn't exceed 4 ⋅ 10^5.
  
  Output
  
  For each test case, output the maximum number of words that compose an interesting story. Print 0 if there's no way to make a non-empty interesting story.
  
  Example
  
  Input
  
  
  6
  3
  bac
  aaada
  e
  3
  aba
  abcde
  aba
  2
  baba
  baba
  4
  ab
  ab
  c
  bc
  5
  cbdca
  d
  a
  d
  e
  3
  b
  c
  ca
  
  
  Output
  
  
  3
  2
  0
  2
  3
  2
  
  Note
  
  In the first test case of the example, all 3 words can be used to make an interesting story. The interesting story is "bac aaada e".
  
  In the second test case of the example, the 1-st and the 3-rd words can be used to make an interesting story. The interesting story is "aba aba". Stephen can't use all three words at the same time.
  
  In the third test case of the example, Stephen can't make a non-empty interesting story. So the answer is 0.
  
  In the fourth test case of the example, Stephen can use the 3-rd and the 4-th words to make an interesting story. The interesting story is "c bc".
solution: import java.io.*;
  import java.util.*;
  import java.util.Map.Entry;
  import java.math.*;
  import java.lang.*;
  
  public class C_Interesting_Story implements Runnable {
      static class InputReader {
          private InputStream stream;
          private byte[] buf = new byte[1024];
          private int curChar;
          private int numChars;
          private SpaceCharFilter filter;
          private BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  
          public InputReader(InputStream stream) {
              this.stream = stream;
          }
  
          public int read() {
              if (numChars == -1)
                  throw new InputMismatchException();
  
              if (curChar >= numChars) {
                  curChar = 0;
                  try {
                      numChars = stream.read(buf);
                  } catch (IOException e) {
                      throw new InputMismatchException();
                  }
  
                  if (numChars <= 0)
                      return -1;
              }
              return buf[curChar++];
          }
  
          public String nextLine() {
              String str = "";
              try {
                  str = br.readLine();
              } catch (IOException e) {
                  e.printStackTrace();
              }
              return str;
          }
  
          public int nextInt() {
              int c = read();
  
              while (isSpaceChar(c))
                  c = read();
  
              int sgn = 1;
  
              if (c == '-') {
                  sgn = -1;
                  c = read();
              }
  
              int res = 0;
              do {
                  if (c < '0' || c > '9')
                      throw new InputMismatchException();
                  res *= 10;
                  res += c - '0';
                  c = read();
              } while (!isSpaceChar(c));
  
              return res * sgn;
          }
  
          public long nextLong() {
              int c = read();
              while (isSpaceChar(c))
                  c = read();
              int sgn = 1;
              if (c == '-') {
                  sgn = -1;
                  c = read();
              }
              long res = 0;
  
              do {
                  if (c < '0' || c > '9')
                      throw new InputMismatchException();
                  res *= 10;
                  res += c - '0';
                  c = read();
              } while (!isSpaceChar(c));
              return res * sgn;
          }
  
          public double nextDouble() {
              int c = read();
              while (isSpaceChar(c))
                  c = read();
              int sgn = 1;
              if (c == '-') {
                  sgn = -1;
                  c = read();
              }
              double res = 0;
              while (!isSpaceChar(c) && c != '.') {
                  if (c == 'e' || c == 'E')
                      return res * Math.pow(10, nextInt());
                  if (c < '0' || c > '9')
                      throw new InputMismatchException();
                  res *= 10;
                  res += c - '0';
                  c = read();
              }
              if (c == '.') {
                  c = read();
                  double m = 1;
                  while (!isSpaceChar(c)) {
                      if (c == 'e' || c == 'E')
                          return res * Math.pow(10, nextInt());
                      if (c < '0' || c > '9')
                          throw new InputMismatchException();
                      m /= 10;
                      res += (c - '0') * m;
                      c = read();
                  }
              }
              return res * sgn;
          }
  
          public String readString() {
              int c = read();
              while (isSpaceChar(c))
                  c = read();
              StringBuilder res = new StringBuilder();
              do {
                  res.appendCodePoint(c);
                  c = read();
              } while (!isSpaceChar(c));
  
              return res.toString();
          }
  
          public boolean isSpaceChar(int c) {
              if (filter != null)
                  return filter.isSpaceChar(c);
              return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
          }
  
          public String next() {
              return readString();
          }
  
          public interface SpaceCharFilter {
              public boolean isSpaceChar(int ch);
          }
      }
  
      public static void main(String args[]) throws Exception {
          new Thread(null, new C_Interesting_Story(), "Main", 1 << 27).start();
      }
  
      static class Pair {
          int f;
          int s;
          int p;
          PrintWriter w;
  
          // int t;
  
          Pair(int f, int s) {
              // Pair(int f,int s, PrintWriter w){
              this.f = f;
              this.s = s;
              // this.p = p;
              // this.w = w;
              // this.t = t;
  
          }
  
          public static Comparator<Pair> wc = new Comparator<Pair>() {
              public int compare(Pair e1,Pair e2){
  
                  // 1 for swap
                  if(Math.abs(e1.f)-Math.abs(e2.f)!=0){
                      // e1.w.println("**"+e1.f+" "+e2.f);
                      return (Math.abs(e1.f)-Math.abs(e2.f));
                  }
                  else{
                      // e1.w.println("##"+e1.f+" "+e2.f);
                      return (Math.abs(e1.s)-Math.abs(e2.s));
                  }
  
  
              }
          };
      }
  
      public Integer[] sort(Integer[] a) {
          Arrays.sort(a);
          return a;
      }
  
      public Long[] sort(Long[] a) {
          Arrays.sort(a);
          return a;
      }
  
      public static ArrayList<Integer> sieve(int N) {
          int i, j, flag;
  
          ArrayList<Integer> p = new ArrayList<Integer>();
  
          for (i = 1; i < N; i++) {
  
              if (i == 1 || i == 0)
                  continue;
  
              flag = 1;
  
              for (j = 2; j <= i / 2; ++j) {
                  if (i % j == 0) {
                      flag = 0;
                      break;
                  }
              }
              if (flag == 1) {
                  p.add(i);
              }
          }
          return p;
      }
  
      public static long gcd(long a, long b) {
          if (b == 0)
              return a;
          else
              return gcd(b, a % b);
      }
  
      public static int gcd(int a, int b) {
          if (b == 0)
              return a;
          else
              return gcd(b, a % b);
      }
  
      //// recursive dfs
      public static int dfs(int s, ArrayList<Integer>[] g, long[] dist, boolean[] v, PrintWriter w, int p) {
          v[s] = true;
          int ans = 1;
          // int n = dist.length - 1;
          int t = g[s].size();
          // int max = 1;
          for (int i = 0; i < t; i++) {
              int x = g[s].get(i);
              if (!v[x]) {
                  // dist[x] = dist[s] + 1;
                  ans = Math.min(ans, dfs(x, g, dist, v, w, s));
              } else if (x != p) {
                  // w.println("* " + s + " " + x + " " + p);
                  ans = 0;
              }
          }
          // max = Math.max(max,(n-p));
          return ans;
      }
  
      //// iterative BFS
      public static int bfs(int s, ArrayList<Integer>[] g, long[] dist, boolean[] b, PrintWriter w, int p) {
          b[s] = true;
          int siz = 1;
          // dist--;
          Queue<Integer> q = new LinkedList<>();
          q.add(s);
          while (q.size() != 0) {
              int i = q.poll();
              Iterator<Integer> it = g[i].listIterator();
              int z = 0;
              while (it.hasNext()) {
                  z = it.next();
                  if (!b[z]) {
                      b[z] = true;
                      // dist--;
                      dist[z] = dist[i] + 1;
                      // siz++;
                      q.add(z);
                  } else if (z != p) {
                      siz = 0;
                  }
              }
  
          }
          return siz;
      }
  
      public static int lower(int a[], int x) { // x is the target value or key
          int l = -1, r = a.length;
          while (l + 1 < r) {
              int m = (l + r) >>> 1;
              if (a[m] >= x)
                  r = m;
              else
                  l = m;
          }
          return r;
      }
  
      public static int upper(int a[], int x) {// x is the key or target value
          int l = -1, r = a.length;
          while (l + 1 < r) {
              int m = (l + r) >>> 1;
              if (a[m] <= x)
                  l = m;
              else
                  r = m;
          }
          return l + 1;
      }
  
      public static int lower(ArrayList<Integer> a, int x) { // x is the target value or key
          int l = -1, r = a.size();
          while (l + 1 < r) {
              int m = (l + r) >>> 1;
              if (a.get(m) >= x)
                  r = m;
              else
                  l = m;
          }
          return r;
      }
  
      public static int upper(ArrayList<Integer> a, int x) {// x is the key or target value
          int l = -1, r = a.size();
          while (l + 1 < r) {
              int m = (l + r) >>> 1;
              if (a.get(m) <= x)
                  l = m;
              else
                  r = m;
          }
          return l + 1;
      }
  
      public static long power(long x, long y, long m) {
          if (y == 0)
              return 1;
  
          long p = power(x, y / 2, m) % m;
          p = (p * p) % m;
  
          if (y % 2 == 0)
              return p;
          else
              return (x * p) % m;
      }
  
      public void yesOrNo(boolean f) {
          if (f) {
              w.println("YES");
          } else {
              w.println("NO");
          }
      }
  
      // Arrays.sort(rooms, (room1, room2) -> room1[1] == room2[1] ? room1[0]-room2[0]
      // : room2[1]-room1[1]);
      // Arrays.sort(A, (a, b) -> Integer.compare(a[0] , b[0]));
      //////////////////////////////////////////////////////////////////////////////////////////////////////
      //////////////////////////////////////////////////////////////////////////////////////////////////////
      // code here
      int oo = (int) 1e9;
      int[] parent;
      int[] dist;
      int[][] val;
      boolean[][] vis;
      ArrayList<Integer>[] g;
      // int[] col;
      // HashMap<Long, Boolean>[] dp;
      //char[][] g;
      // boolean[][] v;
      Long[] a;
      // ArrayList<Integer[]> a;
      // int[][] ans;
      long[][] dp;
      long mod;
      int n;
      int m;
      int k;
      long[][] pre;
      // StringBuilder[] a;
      // StringBuilder[] b;
      // StringBuilder ans;
      int[][] col;
      int[][] row;
      PrintWriter w = new PrintWriter(System.out);
  
      public void run() {
  
          InputReader sc = new InputReader(System.in);
  
          int defaultValue = 0;
          mod =  1000000007;
  
          int test = 1;
          test = sc.nextInt();
          while (test-- > 0) {
            int n =sc.nextInt();
            ArrayList<String> arr =new ArrayList<>();
           
            while(n-->0){
                String s = sc.next();
                arr.add(s);
            }
            int ans=0;
                for(int i=0;i<5;i++){
                int val=solve(arr,(char)(i+'a'));
                if(val>ans)
                ans=val;
                } 
            
            w.println(ans);
          }
  
          w.flush();
          w.close();
  
      }
      public static int solve(ArrayList<String>arr , char ch){
         
         ArrayList<Integer> temp = new ArrayList<>();
         for(int i=0;i<arr.size();i++){
          int count =0;
            String word = arr.get(i);
            for(int j=0;j<word.length();j++){
                if(word.charAt(j)==ch)count++;
                else
                count--;
            }
            temp.add(count);
          }
          Collections.sort(temp);
          Collections.reverse(temp);
            int k=0,ans=0;
            for(int i=0;i<temp.size();i++){
                 k+=temp.get(i);
                 if(k<=0)break;
                 ans++;
            }
         
         return ans;
      }
  }
  
  