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Matching on unique combinations

Joining on a single column like type can produce too many matches when that column isn't unique. A type_benchmarks DataFrame has target prices for specific type and beach combinations. To get one benchmark per listing, join on both columns so each combination uniquely identifies a row.

polars is loaded as pl, and the DataFrames hotels and type_benchmarks are available for you.

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100 XP

Join hotels with type_benchmarks on type and beach, keeping only rows that match in both DataFrames.
Print a few rows to verify the result.

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