import java.util.*;
import java.io.*;
import java.math.*;
public class Main {
static String mutate(String old,int k,char b){
StringBuffer temp = new StringBuffer(old);
temp.setCharAt(k,b);
return temp.toString();
}
static void cross(ArrayList<String> genes,int d1,int d2,int k1,int k2){
String dna1 = genes.get(d1);
String dna2 = genes.get(d2);
String ans1 = dna1.substring(0,k1-1)+dna2.substring(k2-1);
String ans2 = dna2.substring(0,k2-1)+dna1.substring(k1);
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