class Mentor
{
    isA Student;
position 171 43 109 41;
}

class Student
{
  position 184 139 109 41;
}

class Mentor
{
  isA Student;
}

class Mentor
{
  position 121 82 109 41;
}

class Student
{
  position 121 214 109 41;
}

class Mentor
{
  isA Student;
  position 171 43 109 41;
}

class Student
{
  position 184 139 109 41;
}