#include<bits/stdc++.h>
#include "combo.h"
//#include "grader.cpp"
using namespace std;
string guess_sequence(int n) {
string l[4]={"A","B","X","Y"};
string s;
if(press(l[0]+l[1])){
if(press(l[1])){
swap(l[0],l[1]);
}
}
else if(press(l[2])){
swap(l[0],l[2]);
}
else{
swap(l[0],l[3]);
}
s+=l[0];
while(s.size()<n-1){
string temp=s+l[1]+l[1] + s+l[1]+l[2] + s+l[1]+l[2] + s+l[2];
int x=press(temp);
if(x==s.size()+2){
s+=l[1];
}
else if(x==s.size()+1){
s+=l[2];
}
else{
s+=l[3];
}
}
if(press(s+l[1])==s.size()+1) s+=l[1];
else if(press(s+l[2])==s.size()+1) s+=l[2];
else s+=l[3];
return s;
}
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