 
 <prompt> text: ```To make date clear, dem fit use dual dating or Old Style (O.S.) and New Style (N.S.). Dual dating dey use two years wey follow each other sake of difference for when the year dey start, or e fit include both Julian and Gregorian dates. Old Style and New Style (N.S.) fit show whether the start of Julian year don change to start on 1 January (N.S.) even though documents wey dem write that time dey use different start of year (O.S.), or whether a date dey follow Julian calendar (O.S.) instead of Gregorian (N.S.).

The Gregorian calendar na reform of the Julian calendar wey Pope Gregory XIII put for ground for 1582, and na him the calendar take him name, by papal bull Inter gravissimas wey dem date 24 February 1582. The reason for the adjustment na to make Easter celebration dey happen for the time of year wey early Church dey celebrate am. Even though First Council of Nicaea for 325 talk say all Christians suppose celebrate Easter on the same day, e take almost five centuries before almost all Christians fit achieve that goal by following the rules of Church of Alexandria (see Easter for the issues wey come up).

Answer the following questions:
1. How Old Style dey abbreviated?
2. How New Style dey abbreviated?
3. Dual dating dey use how many years wey follow each other?
4. Which dates dey included for dual dating?
5. OS and NS dey dictate the start of which year?
6. When Julian year dey start?
7. The Gregorian calendar modify which version?
8. When dem modify the Julian calendar?

Numbered answers:``` <response>: ```1. OS
2. NS
3. two
4. Julian and Gregorian
5. Julian
6. 1 January
7. Julian
8. 1582``` 