sanitised_words.discard('')
with open('words.txt', 'w') as f:
f.write('\n'.join(sorted(sanitised_words, key=lambda w: (len(w), w))))
sanitised_words.discard('')
with open('words.txt', 'w') as f:
f.write('\n'.join(sorted(sanitised_words, key=lambda w: (len(w), w))))