#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int N) {
string p="",s="";
p=press("AB")?press("A")?"A":"B":press("X")?"X":"Y";
for(auto&c:"ABXY") if(c!=p[0]) s+=c;
for(int i=1,k;i<N-1;++i){
k=press(p+s[0]+s[0]+p+s[0]+s[1]+p+s[0]+s[2]+p+s[1]);
if(k==i) p+=s[2];
else if(k==i+1) p+=s[1];
else p+=s[0];
}
if(N>1){
if(press(p+s[0])==N) p+=s[0];
else if(press(p+s[1])==N) p+=s[1];
else p+=s[2];
}
return p;
}
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