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referenceParameterMystery2

What is the output from the following C++ program? 

void sentence(string& major, string fred, string& foo) {
    cout << "Many a " << foo << " in the " << fred << " of " << major << endl;
    major[0] = 'X';
    foo[1] = 'Z';
}

int main() {
    string major = "fred";
    string fred = "computer";
    string computer = "department";
    string department = "student";
    string student = "major";

    sentence(major, fred, department);
    sentence(student, department, major);
    sentence(fred, "major", student);
    return 0;
}
output

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