//============================================================================
// Name        : main1080.cpp
// Author      : 
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>
#include <string>
using namespace std;

int MIN_INT = -1000000000;

int mx(int a, int b){
	return a>b? a: b;
}

int fsb[5][5] = {{5,-1,-2,-1,-3}, {-1,5,-3,-2,-4}, {-2,-3,5,-2,-2}, {-1,-2,-2,5,-1}, {-3,-4,-2,-1,MIN_INT}};

int toIdx(char c){
	switch(c){
	case 'A': return 0;
	case 'C': return 1;
	case 'G': return 2;
	case 'T': return 3;
	default: return 4;
	}
}

int main() {
	int cases;
	cin >> cases;
	for(int ii = 0; ii < cases; ii++){
		int len1, len2;
		string s1, s2;
		cin >> len1 >> s1 >> len2 >> s2;
		int fen[110][110];
		//fen[0][0] = 0;
		//for(int i = 1; i <= len1; i++) fen[i][0] = MIN_INT;
		//for(int i = 1; i <= len2; i++) fen[0][i] = MIN_INT;
		for(int i = 0; i <= len1; i++){
			for(int j = 0; j <= len2; j++){
				if(i == 0 && j == 0){
					fen[i][j] = 0;
					continue;
				}
				int temp = MIN_INT;
				if(i > 0) temp = mx(temp, fen[i-1][j] + fsb[toIdx(s1[i-1])][4]);
				if(j > 0) temp = mx(temp, fen[i][j-1] + fsb[4][toIdx(s2[j-1])]);
				if(i > 0 && j > 0) temp = mx(temp, fen[i-1][j-1] + fsb[toIdx(s1[i-1])][toIdx(s2[j-1])]);
				fen[i][j] = temp;
			}
		}
		cout << fen[len1][len2] << endl;
	}
	//cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
	return 0;
}