Sources for the provided word sets:

- official_wordle_guesses.txt: list of all words that are considered valid guesses in Wordle (retrieved: https://gist.github.com/cfreshman/cdcdf777450c5b5301e439061d29694c)
- possible_words.txt: a subset of official_wordle_guesses.txt
- possible_words_100.txt: a smaller subset of official_wordle_guesses.txt
- possible_words_four.txt: list of possible four-letter words (retrieved: https://gist.github.com/paulcc/3799331)
- possible_words_seven.txt: list of possible seven-letter words (retrieved: https://github.com/powerlanguage/word-lists/blob/master/common-7-letter-words.txt)