clojure {:deps {clojure.data.csv {:mvn/version "1.4.0"}}} clojure (ns my-csv-analysis (:require [clojure.data.csv :as csv])) clojure (def input-stream (clojure.java.io/reader "example.csv")) (def data (csv/read-csv input-stream)) clojure (def filtered-data (filter #(= (nth % 2) "China") data)) (def transformed-data (map #(vector (nth % 0) (nth % 1)) filtered-data)) (def aggregated-data (reduce (fn [acc row] (update acc (nth row 1) conj (nth row 0))) {} transformed-data)) clojure (def output-stream (clojure.java.io/writer "output.csv")) (csv/write-csv output-stream aggregated-data)