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class Animal { constructor(type, name, sound) { this.type = type; this.name = name; this.sound = sound; } say() { console.log(this.sound); } } const dog = new Animal("개", "멍멍이", "멍멍"); const cat = new Animal("고양이", "야옹이", "야옹"); dog.say(); cat.say(); ------------------------------------------------------------------------ extended class Animal { constructor(type, name, sound) { this.type = type;..