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* ``.random_sample()`` now returns a list of unique elements instead of a set.
* ``.random_sample_unique()`` is removed in favor of ``.random_sample()``.
* Added ``random_choices()``, ``random_elements()`` and ``random_letters()``.
* Added ``faker.utils.distribution.choices_distribution_unique()``.
* ``words()``, ``password()``, ``uri_path`` and ``pystr()`` now use the new the
``random_choices()`` method.