Poznajemy różnorodne struktury. received_437401577785023 received_319121583047642 received_1101317934006726 received_228130549345794 received_694934628148010 received_421790562911417 received_298154048838291 received_298154048838291 received_631201161340842 received_6628180293890655 received_964472377612497