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interface Item {
int getId();
String getTitle();
int getDuration();
}
class MusicalElement implements Item {
private int id, duration;
private String title, content;
public MusicalElement(int id, String title, int duration, String content) {
this.id=id;
this.title=title;
this.duration=duration;
this.content=content;
}
public int getId(){return id;}
public String getTitle(){return title;}
public int getDuration(){return duration;}
}
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