/** Class for a directory storing pairs of Student objects. */
public class StudentPairDirectory {

  protected PersonPairDirectory directory;

  public StudentPairDirectory() {
    directory = new PersonPairDirectory ();
  }

  public void insert(Student s, Student t) {
    directory.insert(s,t);
  }

  public Student findOther(Student s) {
    return (Student) directory.findOther(s);
  }

  public void remove(Student s, Student t) {
    directory.remove(s, t);
  }
}