How do you insert a map-reduce into a Polars method chain?

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Peter Schneider
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How do you insert a map-reduce into a Polars method chain?
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(stackoverflow.com/users/122792/thomas-browne)Thomas Browne
(stackoverflow.com/users/1744834/roman)roman
(stackoverflow.com/users/19355181/jqurious)jqurious
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