extends Person {
      constructor(first, last, age, gender, interests, subject, grade) {
        super(first, last, age, gender, interests);

        // subject and grade are specific to Teacher
        this.subject = subject;
        this.grade = grade;
      }
    }

    // Instantiate Teacher

    let snape = new Teacher('Severus', 'Snape', 58, 'male', ['Potions'], 'Dark arts', 5);
    snape.greeting(); // Hi! I'm Severus.
    snape.farewell(); // Severus has left the building. Bye for now.
    console.