['Words', 'words', 'words', '']
['Words', ', ', 'words', ', ', 'words', '.', '']
['Words', 'words, words.']
['0', '3', '9']
['', '...', 'words', ', ', 'words', '...', '']
['foo']
['Words', 'words', 'words']
[('abc', 'def')]
[('abc', 'def'), ('abc', 'def'), ('abc', 'def')]
['abc']
[('abc', ''), ('', 'def'), ('abc', ''), ('', 'def'), ('abc', ''), ('', 'def'), ('abc', '')]