Group Anagrams

Two words are anagrams if they use exactly the same letters, like "listen" and "silent".

Implement group_anagrams(words) that groups the words into anagram families.

Requirements

• Return a list of groups, where each group is a list of words.
• Keep words in each group in the order they first appeared.
• Order the groups by when their first word appeared.

Example

group_anagrams(["eat", "tea", "tan", "ate", "nat", "bat"])
# [["eat", "tea", "ate"], ["tan", "nat"], ["bat"]]