#include<iostream>
#include<algorithm>
#include<cmath>
#include<cstring>
#include<vector>
using namespace std;
#define For(a,begin,end) f
#include<iostream>
#include<algorithm>
#include<cmath>
#include<cstring>
#include<vector>
using namespace std;
#define For(a,begin,end) f
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