import java.util.ArrayList;
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Main {
    public static void main(String[] args){
        int size1=0;
        int size2=0;
        ArrayList<Integer> subsq1;
        ArrayList<Integer> subsq2;
        Scanner sc=new Scanner(System.in);
        int caseNum=sc.nextInt();
        sc.nextLine();
        while(caseNum>0){
            size1=sc.nextInt();
            size2=sc.nextInt();
            sc.nextLine();
            subsq1=new ArrayList<Integer>();
            subsq2=new ArrayList<Integer>();
            while(size1>0){
                subsq1.add(sc.nextInt());
                size1--;
            }
            sc.nextLine();
            while(size2>0){
                subsq2.add(sc.nextInt());
                size2--;
            }
            solver(subsq1,subsq2);          
            caseNum--;
        }
        return;
    }
    public static void solver(ArrayList<Integer> subsq1,ArrayList<Integer> subsq2){
        int result=0;
        ArrayList<ArrayList<Integer>> tokenized1=reducer(subsq1);
        ArrayList<ArrayList<Integer>> tokenized2=reducer(subsq2);
        Set<Integer> buffer=new HashSet<Integer>();
        for(int i=0;i<tokenized1.size();i++){
            for(int j=0;j<tokenized2.size();j++){
                buffer.clear();
                buffer=insertBuffer(buffer,tokenized1.get(i));
                buffer=insertBuffer(buffer,tokenized2.get(j));
                if(buffer.size()>result)
                    result=buffer.size();
            }
        }
        System.out.println(result);
    }
    public static ArrayList<ArrayList<Integer>> reducer(ArrayList<Integer> subsq1){
        ArrayList<ArrayList<Integer>> tokenized1=new ArrayList<ArrayList<Integer>>();
        int index1=0;
        for(int i=0,j=0;i<subsq1.size()-1;i++){
            if(subsq1.get(i)>subsq1.get(i+1)){
                tokenized1.add(new ArrayList<Integer>());
                for(int k=j;k<subsq1.size();k++){
                    if(subsq1.get(j)>subsq1.get(k))
                        continue;
                    tokenized1.get(index1).add(subsq1.get(k));
                }
                j=i+1;
                index1++;
            }
            if(i==subsq1.size()-2){
                tokenized1.add(new ArrayList<Integer>());
                for(int k=j;k<subsq1.size();k++){
                    tokenized1.get(index1).add(subsq1.get(k));
                }
            }
        }
        return tokenized1;
    }
    public static Set<Integer> insertBuffer(Set<Integer> buffer,ArrayList<Integer> subsq1){
        for(int i=0;i<subsq1.size();i++){
            buffer.add(subsq1.get(i));
        }
        return buffer;
    }
}