explanation: https://www.helpforenglish.cz/article/2009112303-zjednodusena-cetba
links:
https://www.penguin-readers.cz/?gclid=Cj0KCQjwhb36BRCfARIsAKcXh6Fixv8kgultoNhEllSqtkBIhifyG8J2fPVUSQfL1KrZwThDmdI3smMaAp1GEALw_wcB
https://www.macmillan.cz/readers
