export function groupAnagrams(words: string[]): string[][] {
  const groupOfWords = new Map()

  for (const word of words) {
    const key = [...word].sort().join('')

    if (!groupOfWords.has(key)) {
      groupOfWords.set(key, [word])
    } else {
      groupOfWords.get(key)?.push(word)
    }
  }

  const orderedWords = [...groupOfWords.values()]
    .map(words => [...words].sort())
    .sort()

  return orderedWords
}