class Kamus {
  constructor() {
    this.data = new Map();
  }
 
  tambah(kata, sinonimList) {
    if (!this.data.has(kata)) {
      this.data.set(kata, new Set());
    }
 
    sinonimList.forEach(sinonim => {
      this.data.get(kata).add(sinonim);
 
      if (!this.data.has(sinonim)) {
        this.data.set(sinonim, new Set());
      }
      this.data.get(sinonim).add(kata);
    });
  }
 
  ambilSinonim(kata) {
    if (!this.data.has(kata)) return null;
 
    return Array.from(this.data.get(kata));
  }
}
 
const kamus = new Kamus();
kamus.tambah('big', ['large', 'great']);
kamus.tambah('big', ['huge', 'fat']);
kamus.tambah('huge', ['enormous', 'gigantic']);
 
console.log(kamus.ambilSinonim('big'));
console.log(kamus.ambilSinonim('huge'));
console.log(kamus.ambilSinonim('gigantic'));
console.log(kamus.ambilSinonim('colossal'));

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