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Creating an Object dtype

For an ad-hoc text exploration, the team wants each movie's title as a Python set of lowercase words. A set isn't a native Polars dtype, so store it in a column of dtype pl.Object.

The DataFrame movies is available, and the helper title_to_word_set(title) is already defined and returns a Python set of lowercase words from a title.

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Run title_to_word_set on each movie_title and store the returned Python sets in a new column.
Alias the new column as title_word_set.

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