class Kamus {
  constructor() {
    this.daftarKata = new Map();
  }
 
  tambah(kata, sinonim) {
    const sinonimLama = this.daftarKata.get(kata) || [];
    this.daftarKata.set(kata, [...sinonimLama, ...sinonim]);
  }
 
  ambilSinonim(kata) {
    const hasil = new Set(this.daftarKata.get(kata));
 
    for (const [kataUtama, daftarSinonim] of this.daftarKata.entries()) {
      if (daftarSinonim.includes(kata)) {
        hasil.add(kataUtama);
      }
    }
 
    return hasil.size ? Array.from(hasil) : null;
  }
}
 
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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