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.math.*;
  import java.math.BigInteger;
  
  
  public final class A
  {    
  	static PrintWriter out = new PrintWriter(System.out); 
  	static StringBuilder ans=new StringBuilder();
  	static FastReader in=new FastReader();
  	static ArrayList<Integer> g[];
  	static long mod=(long)1e9+7,INF=Long.MAX_VALUE;
  	static boolean set[],col[]; 
  	static int par[],tot[],partial[];
  	static int D[],P[][];
  	static long dp[][],sum=0,max=0,size[];
  	//	static node1 seg[];
  	//static pair moves[]= {new pair(-1,0),new pair(1,0), new pair(0,-1), new pair(0,1)};
  	public static void main(String args[])throws IOException
  	{				
  
  
  	
  		int T=i();
  		outer:while(T-->0)
  		{
  			int N=i();
  			int size[]=new int[N];
  			PriorityQueue<node1> q[]=new PriorityQueue[26];
  			for(int i=0; i<26; i++)q[i]=new PriorityQueue<node1>();
  			for(int i=0; i<N; i++)
  			{
  				char X[]=in.next().toCharArray();
  				int s=X.length;
  				size[i]=s;
  				int f[]=new int[26];
  				for(char x:X)f[x-'a']++;
  				for(int j=0; j<26; j++)q[j].add(new node1(f[j],i,s));
  			}
  			
  			int max=0;
  			for(int i=0; i<26; i++)
  			{
  				PriorityQueue<node1> q_new=new PriorityQueue<>();
  				q_new=q[i];
  				int c=0;
  				long f=0;
  				while(q_new.size()>0)
  				{
  					node1 x=q_new.remove();
  //					System.out.println(x.f+" "+x.size+" "+x.a);
  					f+=x.a;
  					if(f>0)
  					{
  						c++;
  						max=Math.max(max, c);
  					}
  					else break;
  				}
  			}
  			out.println(max);
  		}
  		out.close();
  
  	}
  	static int OR(int i,int j)
  	{
  		if(i>j)
  		{
  			int t=i;
  			i=j;
  			j=t;
  		}
  		System.out.println("OR "+i+" "+j);
  		return i();
  	}
  	static int AND(int i,int j)
  	{
  		if(i>j)
  		{
  			int t=i;
  			i=j;
  			j=t;
  		}
  		System.out.println("AND "+i+" "+j);
  		return i();
  	}
  	static int XOR(int i,int j)
  	{
  		if(i>j)
  		{
  			int t=i;
  			i=j;
  			j=t;
  		}
  		System.out.println("XOR "+i+" "+j);
  		return i();
  	}
  
  	static boolean f1(int l,char X[])
  	{
  		int i=0;
  		for(; l<X.length; l++)
  		{
  			if(X[i]!=X[l])return false;
  			i++;
  		}
  		return true;
  	}
  	static int f(int a)
  	{
  		for(int i=a+1; a>0; a++)
  		{
  			if(GCD(i,a)==1)return i;
  		}
  		return 0;
  	}
  	static int min(char X[],char str[],int N)
  	{
  		int s=0;
  		for(int i=0; i<N; i++)
  		{
  			int it=i%3;
  			if(X[i]!=str[it])s++;
  			//             ans.append(str[it]);
  		}
  		return s;
  	}
  	static char f(int i,char X[])
  	{
  		int a=0,b=0,c=0;
  		for(; i<X.length; i+=3)
  		{
  			if(X[i]=='R')a++;
  			if(X[i]=='B')b++;
  			if(X[i]=='G')c++;
  		}
  		if(a>=b && a>=c)return 'R';
  		if(b>=a && b>=c)return 'B';
  		return 'G';
  	}
  
  
  	static void f1(int n,int p,long sum,int N)
  	{
  		for(int c:g[n])
  		{
  			if(c==p)continue;
  
  			long s=sum+N-2*size[c];
  			f1(c,n,s,N);
  			max=Math.max(max, s);
  		}
  	}
  	static long f(int i,int j,ArrayList<Integer> A)
  	{
  
  		if(i+1==A.size())
  		{
  			return j;
  		}		
  		int moves=1+A.get(i);
  		if(j==1)return 1+f(i+1,moves,A);
  		if(j>0 && dp[i][j-1]==0)f(i,j-1,A);
  		return dp[i][j]=dp[i][j-1]+f(i+1,j+moves,A);
  	}
  	//	static void build(int v,int tl,int tr,long A[])
  	//	{
  	//		if(tl==tr)
  	//		{
  	//			seg[v]=new node1(A[tl],A[tr],1,true);
  	//			return ;
  	//		}
  	//		int tm=(tl+tr)/2;
  	//		build(2*v,tl,tm,A);
  	//		build(2*v+1,tm+1,tr,A);
  	//		seg[v]=merge(seg[2*v],seg[2*v+1]);
  	//	}
  	//	static node1 ask(int v,int tl,int tr,int l,int r)
  	//	{
  	//		if(l>r)return new node1(0,0,0,false);//verify true or false
  	//		if(tl==l && tr==r)return seg[v];
  	//		int tm=(tl+tr)/2;
  	//		node1 a=ask(v*2,tl,tm,l,Math.min(tm, r));
  	//		node1 b=ask(v*2+1,tm+1,tr,Math.max(tm+1, l),r);
  	//		return merge(a,b);
  	//	}
  	//	static node1 merge(node1 a,node1 b)
  	//	{
  	//		long s=0;
  	//		long l1=a.L,r1=a.R,c1=a.cnt;
  	//		long l2=b.L,r2=b.R,c2=b.cnt;
  	//		long g=GCD(l2,r1); s=c1+c2;
  	//		if(g==1)
  	//		{
  	//			s--;
  	//			g=(l2*r1)/g;
  	//			if(c1==1)
  	//			{
  	//				l1=g;
  	//			}
  	//			if(c2==1)r2=g;
  	//			return new node1(l1,r2,s,true);
  	//		}
  	//		return new node1(l1,r2,s,a.leaf^b.leaf);
  	//	}
  	static long f(long l,long r,long a,long b,long N)
  	{
  		while(r-l>1)
  		{
  			long m=(l+r)/2;
  			long x=m*b;
  			if(N<x)
  			{
  				r=m;
  				continue;
  			}
  			if((N-x)%a==0)r=m;
  			else l=m;
  
  		}
  		return r;
  	}
  	static long f1(long a,long A[],long bits[],long sum)
  	{
  		long s=A.length;
  		s=mul(s,a);
  		s=(s+(sum%mod))%mod;
  		long p=1L;
  		for(long x:bits)
  		{
  			if((a&p)!=0)s=((s-mul(x,p))+mod)%mod;
  			p<<=1;
  		}
  		return s;
  	}
  	static long f2(long a,long A[],long bits[])
  	{
  		long s=0;
  		long p=1L;
  		for(long x:bits)
  		{
  			if((a&p)!=0)
  			{
  				s=(s+mul(p,x))%mod;
  			}
  			p<<=1;
  		}
  		return s;
  	}
  	static long f(long x1,long y1,long x2,long y2)
  	{
  		return Math.abs(x1-x2)+Math.abs(y1-y2);
  	}
  	static long f(long x,long max,long s)
  	{
  		long l=-1,r=(x/s)+1;
  		while(r-l>1)
  		{
  			long m=(l+r)/2;
  			if(x-m*s>max)l=m;
  			else r=m;
  		}
  		return l+1;
  	}
  	static int f(long A[],long x)
  	{
  		int l=-1,r=A.length;
  		while(r-l>1)
  		{
  			int m=(l+r)/2;
  			if(A[m]>=x)r=m;
  			else l=m;			
  		}
  		return r;
  	}
  
  
  
  	static int bin(int x,ArrayList<Integer> A)
  	{
  		int l=0,r=A.size()-1;
  		while(l<=r)
  		{
  			int m=(l+r)/2;
  			int a=A.get(m);
  			if(a==x)return m;
  			if(a<x)l=m+1;
  			else r=m-1;
  		}
  		return 0;
  	}
  	static int left(int x,ArrayList<Integer> A)
  	{
  		int l=-1,r=A.size();
  		while(r-l>1)
  		{
  			int m=(l+r)/2;
  			int a=A.get(m);
  			if(a<=x)l=m;
  			else r=m;
  		}
  		return l;
  	}
  	static int right(int x,ArrayList<Integer> A)
  	{
  		int l=-1,r=A.size();
  		while(r-l>1)
  		{
  			int m=(l+r)/2;
  			int a=A.get(m);
  			if(a<x)l=m;
  			else r=m;
  		}
  		return r;
  	}
  
  
  
  	static boolean equal(long A[],long B[])
  	{
  		for(int i=0; i<A.length; i++)if(A[i]!=B[i])return false;
  		return true;	
  	}
  
  
  	static int max(int a ,int b,int c,int d)
  	{
  		a=Math.max(a, b);
  		c=Math.max(c,d);
  		return Math.max(a, c);
  	}
  	static int min(int a ,int b,int c,int d)
  	{
  		a=Math.min(a, b);
  		c=Math.min(c,d);
  		return Math.min(a, c);
  	}
  
  
  
  	static HashMap<Integer,Integer> Hash(int A[])
  	{
  		HashMap<Integer,Integer> mp=new HashMap<>();
  		for(int a:A)
  		{
  			int f=mp.getOrDefault(a,0)+1;
  			mp.put(a, f);
  		}
  		return mp;
  	}
  	static long mul(long a, long b)
  	{
  		return ( a %mod * 1L * b%mod )%mod;
  	}
  	static void swap(int A[],int a,int b)
  	{
  		int t=A[a];
  		A[a]=A[b];
  		A[b]=t;
  	}
  
  
  	static int find(int a)
  	{
  		if(par[a]<0)return a;
  		return par[a]=find(par[a]);
  	}
  	static void union(int a,int b)
  	{
  		a=find(a);
  		b=find(b);
  		if(a!=b)
  		{
  			par[a]+=par[b];
  			par[b]=a;
  		}
  	}
  	static boolean isSorted(int A[])
  	{
  		for(int i=1; i<A.length; i++)
  		{
  			if(A[i]<A[i-1])return false;
  		}
  		return true;
  	}
  
  	static boolean isDivisible(StringBuilder X,int i,long num)
  	{
  		long r=0;
  		for(; i<X.length(); i++)
  		{
  			r=r*10+(X.charAt(i)-'0');
  			r=r%num;
  		}
  		return r==0;
  	}    
  
  
  
  	static int lower_Bound(int A[],int low,int high, int x) 
  	{ 
  		if (low > high) 
  			if (x >= A[high]) 
  				return A[high]; 
  
  		int mid = (low + high) / 2; 
  
  		if (A[mid] == x) 
  			return A[mid]; 
  
  		if (mid > 0 && A[mid - 1] <= x && x < A[mid]) 
  			return A[mid - 1]; 
  
  		if (x < A[mid]) 
  			return lower_Bound( A, low, mid - 1, x); 
  
  		return lower_Bound(A, mid + 1, high, x); 
  	} 
  
  	static String f(String A)
  	{
  		String X="";
  		for(int i=A.length()-1; i>=0; i--)
  		{
  			int c=A.charAt(i)-'0';
  			X+=(c+1)%2;
  		}
  		return X;
  	}
  
  	static void sort(long[] a) //check for long
  	{
  		ArrayList<Long> l=new ArrayList<>();
  		for (long i:a) l.add(i);
  		Collections.sort(l);
  		for (int i=0; i<a.length; i++) a[i]=l.get(i);
  	}
  
  	static String swap(String X,int i,int j)
  	{
  		char ch[]=X.toCharArray();
  		char a=ch[i];
  		ch[i]=ch[j];
  		ch[j]=a;
  		return new String(ch);
  	}
  
  	static int sD(long n)  
  	{  
  
  		if (n % 2 == 0 )  
  			return 2;  
  
  		for (int i = 3; i * i <= n; i += 2) {  
  			if (n % i == 0 )  
  				return i;  
  		}  
  
  		return (int)n;  
  	}  
  
  	static void setGraph(int N)
  	{
  		tot=new int[N+1];
  		partial=new int[N+1];
  		D=new int[N+1];
  		P=new int[N+1][(int)(Math.log(N)+10)];
  		set=new boolean[N+1];
  		g=new ArrayList[N+1];
  		for(int i=0; i<=N; i++)
  		{
  
  			g[i]=new ArrayList<>();		
  			D[i]=Integer.MAX_VALUE;
  			//D2[i]=INF;
  		}
  	}
  
  
  
  	static  long pow(long a,long b)
  	{
  		//long mod=1000000007;
  		long pow=1;
  		long x=a;
  		while(b!=0)
  		{
  			if((b&1)!=0)pow=(pow*x)%mod;
  			x=(x*x)%mod;
  			b/=2;
  		}
  		return pow;
  	}
  
  	static long toggleBits(long x)//one's complement || Toggle bits
  	{
  		int n=(int)(Math.floor(Math.log(x)/Math.log(2)))+1;
  
  		return ((1<<n)-1)^x;
  	}
  
  	static int countBits(long a)
  	{
  		return (int)(Math.log(a)/Math.log(2)+1);
  	}
  
  	static long fact(long N)
  	{ 
  		long n=2; 
  		if(N<=1)return 1;
  		else
  		{
  			for(int i=3; i<=N; i++)n=(n*i)%mod;
  		}
  		return n;
  	}
  
  	static int kadane(int A[])
  	{
  		int lsum=A[0],gsum=A[0];
  		for(int i=1; i<A.length; i++)
  		{
  			lsum=Math.max(lsum+A[i],A[i]);
  			gsum=Math.max(gsum,lsum);
  		}
  		return gsum;
  	}
  
  	static void sort(int[] a) {
  		ArrayList<Integer> l=new ArrayList<>();
  		for (int i:a) l.add(i);
  		Collections.sort(l);
  		for (int i=0; i<a.length; i++) a[i]=l.get(i);
  	}
  
  	static boolean isPrime(long 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 void print(char A[])
  	{
  		for(char c:A)System.out.print(c+" ");
  		System.out.println();
  	}
  	static void print(boolean A[])
  	{
  		for(boolean c:A)System.out.print(c+" ");
  		System.out.println();
  	}
  	static void print(int A[])
  	{
  		for(int a:A)System.out.print(a+" ");
  		System.out.println();	
  	}
  	static void print(long A[])
  	{
  		for(long i:A)System.out.print(i+ " ");
  		System.out.println();
  
  	}
  	static void print(ArrayList<Integer> A)
  	{
  		for(int a:A)System.out.print(a+" ");
  		System.out.println();
  	}
  
  	static int i()
  	{
  		return in.nextInt();
  	}
  
  	static long l()
  	{
  		return in.nextLong();
  	}
  
  	static int[] input(int N){
  		int A[]=new int[N];
  		for(int i=0; i<N; i++)
  		{
  			A[i]=in.nextInt();
  		}
  		return A;
  	}
  
  	static long[] inputLong(int N)     {
  		long A[]=new long[N];
  		for(int i=0; i<A.length; i++)A[i]=in.nextLong();
  		return A;
  	}
  
  	static long GCD(long a,long b) 
  	{
  		if(b==0)
  		{
  			return a;
  		}
  		else return GCD(b,a%b );
  	}
  
  }
  class node1 implements Comparable<node1>
  {
  	int index,f,size;
  	long a;
  	node1(int f,int i,int size)
  	{
  		this.f=f;
  		this.index=i;
  		this.size=size;
  		a=2*f-size;
  	}
  	public int compareTo(node1 x)
  	{
  		if(this.a==x.a)return 0;
  		else if(this.a<x.a)return 1;
  		else return -1;
  	}
  }
  
  
  //Code For FastReader
  //Code For FastReader
  //Code For FastReader
  //Code For FastReader
  class FastReader
  {
  	BufferedReader br;
  	StringTokenizer st;
  	public FastReader()
  	{
  		br=new BufferedReader(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 nextLine()
  	{
  		String str="";
  		try
  		{
  			str=br.readLine();
  		}
  		catch (IOException e)
  		{
  			e.printStackTrace();
  		}
  		return str;
  	}
  
  }