Минометчики ВСУ оказались в российском плену после ликвидации позиций сослуживцев08:42
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For example a set (indicated with the #{} syntax in Clojure) is a special function that returns a boolean indicating whether the given argument is a member of the set or not. And complement is a function in clojure.core that effectively inverts the function given to it, so combined (complement #{"year"}) means "every value that is not in the set #{"year"}, which we can then use as our predicate column selector function to filter out certain columns.
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