class PrimaryStudent extends Student {
protected int grade;
public PrimaryStudent (String name, int age, int score,int grade){
super(name,age,score);
this.grade = grade;
}
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class PrimaryStudent extends Student {
protected int grade;
public PrimaryStudent (String name, int age, int score,int grade){
super(name,age,score);
this.grade = grade;
}
}