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#include <iostream>
#include <string>
template <class T1,class t2>
class Pair
{
private:
T1 a;
T2 b;
public:
T1 &first();
T2 &second();
T1 first () const{return a;}
T2 second() const{return b;}
Pair(const T1 &aval, const T2 ^bval):a(aval),b(bval){}
Pair(){}
};