https://khyzhun.medium.com/kotlin-collections-list-set-map-%D0%BF%D1%80%D0%BE%D1%81%D1%82%D0%B8%D0%BC%D0%B8-%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D0%BC%D0%B8-%D0%BE%D1%81%D0%BD%D0%BE%D0%B2%D0%B8-%D0%BF%D1%80%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D1%83%D0%B2%D0%B0%D0%BD%D0%BD%D1%8F-e6a84b47b53d
