class Kamus {
  constructor() {
    this.kamus = {};
  }
 
  tambah(kata, sinonim) {
    if (!this.kamus[kata]) {
      this.kamus[kata] = [];
    }
    this.kamus[kata] = this.kamus[kata].concat(sinonim);
    sinonim.forEach((s) => {
      if (!this.kamus[s]) {
        this.kamus[s] = [];
      }
      this.kamus[s].push(kata);
    });
  }
 
  ambilSinonim(kata) {
    return this.kamus[kata] || 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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