#include <iostream>
using namespace std;
class Student {
public:
void study() {
cout << "Student is studying\n";
}
};
class Teacher {
public:
void teach(Student& s) {
cout << "Teacher is teaching\n";
s.study();
}
};
int main() {
Student s;
Teacher t;
t.teach(s);
return 0;
}
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