Simplify the following text for a Grade 7 native English-speaking person.
Original: See the corresponding sections in ISO 3166-1 alpha-2 , ISO 3166-1 alpha-3 and ISO 3166-1 numeric for their respective user-assigned codes .
Simplified: ISO 3166-1 is published officially in both English and French . Since the second edition of ISO 3166-1 , the following columns are included for each entry :